* All prices incl. Case: Winchester; Twist: 1:12 inches; Primer: Federal 210M, Large Rifle Match; Barrel Length: 24 inches; Trim Length: 2.005 inches. This allows up to 4% more powder space in the case and in many loads yields more velocity than standard 7828. ARCHIVED. These are the first groups with this powder. Cant Find Varget for Sale? CLICK HERE to Read Full Powder Temperature Stability Test on Precision RifleBlog.com. Average extreme velocity spread was only 19 fps for 15 Sierra 142-grain MatchKing bullets fired from prepared cases filled with precisely weighed IMR-4166 charges. The LabRadar is a new type of device that allows you to measure muzzle velocity within at least +/- 0.1% of the reading. Using Hodgdon's online Reloading Data Center I find IMR 4166 listed as an appropriate powder for several 223 loads, from 50 grains bullets all the way up to 90 grain bullets. The top shooters in the PRS and veteran long-range shooters in other disciplines have learned to value a temperature-stable powder. In addition, it is a longtime favorite of Match shooters. New customer? h4895 Reduced Rifle Load. Finally, Enduron powders are environmentally-friendly, crafted from raw materials that are not harmful to the environment. IMR 7977 is a slower burn rate in the Enduron family. Precision shooters will find an Enduron option well-suited to most of the popular precision cartridge types. Very consistent velocity, quality powder, not so good on powder throw due to it being a stick powder. This demand lead to an incredible 2.5 billion pounds of smokeless propellants being manufactured by DuPont for Allied Forces in World War II. Share the post "Guide to IMR Enduron Powders: 4166, 4451, 4955, 7977, 8933". Load data should be forthcoming pretty soon. We need to get back to the good old days! CC 300 BLK ($53.49 per box of 20), Law Tactical Gen 3-M AR Folding Stock Adapter, 2022 Editors Choice Award Winning Silencer Central Banish Backcountry Suppressor. This website uses cookies to ensure the best experience possible. IMR recommends always consulting www.IMRReloading.com for the most accurate, up-to-date data. That is very, very low. FPS low 2735 high 2789 They list loads for Sperry SP and Barnes TTSX in 55gr weights. Awsome powder in my book. (function() { Once they had a couple dozen rounds loaded with each powder, they went and shot them with each powder at 25 F, 65 F, and 140 F. The muzzle velocity of each shot was recorded using both a LabRadar Doppler Radar and a MagnetoSpeed Chronograph. I went to the IMR site and it takes you to hodgdon's loading site. ga.src = ('https:' == document.location.protocol ? both should give you specific info. The pelletized form makes for faster reloads with pre-formed charges that easily drop down the barrel and is easy to pack without the need for measures or funnels. it's a bit bulky when pouring into the 223 case. The main features of the Enduron series are copper fouling eliminator, insensitivity to temperature changes, ideal loading density and being environmentally friendly. I use in 243 Win and 6.5 CM. Thanks, Was looking for an equivalent powder from H4895 when I ran into the 4166. For those who ask.I am obviously loading for a 556 NOT a 223. otherwise why mention I would be using only cases marked as 556! Between 1/3 and 1/2 MOA for 5 shot groups at 200yd. Many F-Open competitors are now using Reloder 16 with considerable success. IMR Enduron 4166 is a versatile, match-grade propellant, with the fastest burn rate in the Enduron line. My factory sierra high 2576 Its a perfect burn speed for cartridges like the 308 Win/7.62mm NATO, 22-250 Remington, 257 Roberts and dozens more. Loading density is perfect for magnums, contributing to superb uniformity. Find load data for IMR 4227 propellant by clicking the button "Loads for this Powder".More about this powder:IMR 4227 is a medium burn speed, magnum pistol propellant. Choose from a variety of powders for everything from small-caliber ammo to magnum rifle cartridges in both 1 lb canisters and 8 lb jugs. 44gr 4166 Loading density is perfect for the very large magnums, including the 6.5mm and 7mm magnums. They also produce specialty rounds designed for competition shooting events like . Share the post "Powder Temp Stability: IMR Enduron vs. Hodgdon Extreme". This powder is comparable to Hodgdon H4831. To be able to use the full range of Shopware 6, we recommend activating Javascript in your browser. As a medium burn speed propellant, XBR is ideally suited for cartridges like the 223 Remington/5.56mm, 308 Winchester/7.62mm NATO and the 6mm PPC. IMRs press release states: IMR 4166 [has] a perfect burn speed for cartridges like the 308 Win/7.62mm NATO, 22-250 Remington and dozens more.. Any gunpowder required by handloaders can be sourced through these brands. IMR states that IMR 4166 is a versatile, match grade propellant. An acronym for. For info on other IMR powders, visit www.imrpowder.com. The technology in IMRs Enduron line of powders provides four very important qualities that enhance both in-gun and downrange performance. Some powders are more affected by changes in temperature than others. It also offers good load density and meters reasonably well. Give it a try if you've already purchased it. IMR 7977 performs comparably to Hodgdon H1000 but charge weights are materially different. IMR 4166 was released a few years ago as a temperature insensitive powder that is expected to replace 4064. Bullets ranged from 50- 77 grain , same bullets shot very well with Varget anf H4895 . IMRs press release provides these descriptions of the new Enduron propellants: IMR 4166 is the first in the series of Enduron propellants. The IMR series of handloading powders were the only choice to wring full performance out of rifle calibers. IMR 4166 Enduron VAT (where applicable), shipping costs and possible delivery charges. Great stuff! IMR 4166 possesses the fastest burn rate in the Enduron lineup. I loaded 23.5 gr in Lapua brass with no trouble using a 10" drop tube: http://www.xxicsi.com/powder-funnel.html _gaq.push(['_setDomainName', '.accurateshooter.com']); A versatile, match-grade propellant, IMR 4166 is comparable to Hodgdon Varget. VISIT THE RDC WHITE HOTS White Hots 50/50 is a 50 Caliber, 50 grain pellet for muzzleloaders. Posted: 7/2/2021 8:19:25 PM EST. Is there a different load data site? They both love it. Other than that , great job, thanks. Well, Im done Adulting for Today and Tomorrow. The new line of IMR Enduron powders feature small kernels for easy metering, plus a built-in copper fouling eliminator. A versatile, match-grade propellant, IMR 4166 is comparable to Hodgdon Varget. Thanks, T.B. The main features of the Enduron series are copper fouling eliminator, insensitivity to temperature changes, ideal loading density and being environmentally friendly. msinc The manual allows for stiffer charges, but at 25.1 the load begins to compress. You can see Hodgdon H4350 had the least variance in muzzle velocity, with just 25 fps over the 115 swing in temperature! If you enjoy the forum please consider supporting it by signing up for aNES Membership The benefits pay for the membership many times over. We continue to prioritize our shipments to our traditional sales channels to maximize powder availability at retailers. Find load data for IMR 8133 Enduron propellant by clicking the button "Loads for this Powder".More about this powder:IMR Enduron 8133 is the slowest burn rate in the Enduron family. For more information and IMR 4166 LOAD DATA visit imrpowder.com or check the 2015 Hodgdon Annual Manual. Versatility with uniformity and accuracy. Reduced Rifle Loads. Reloading 223/ 5.56 for the AR-15 with IMR 4166 30-06JOHN, GUNS AND RELOADING 1.86K subscribers 2.8K views 1 year ago I reload .223/ 5.56 for the AR-15 using a powder not popular, IMR. This propellant performs comparably to Hodgdon H4350 but charge weights are materially different. Weve been quite pleased with IMR 8208 XBR as a Varget alternative. It may not display this or other websites correctly. At 600 yds, the POI with 4166 loads was about 1.2 MOA higher than when using 43.2 gr. 'https://ssl' : 'http://www') + '.google-analytics.com/ga.js'; In 2015, IMR will introduce three (3) new Enduron powders: IMR 4166, IMR 4451, and IMR 7977. Find load data for IMR 4064 propellant by clicking the button "Loads for this Powder".More about this powder:IMR 4064 is a medium-range burn speed powder and is one of the most versatile propellant in the IMR line, used for 223 Remington, 22-250 Remington, 220 Swift, 6mm Remington, 243 Winchester Super Short Magnum, 308 Winchester, 338 Winchester Magnum, and the list goes on and on. Every week of WW II, as many munitions were used as in all of WW I. It is an extruded powder with a perfect burn speed for cartridges like 308 Winchester, 7.62mm NATO, 22-250 Remington or 257 Roberts, among other cartridges. For a better experience, please enable JavaScript in your browser before proceeding. Find load data for IMR 4166 Enduron propellant by clicking the button "Loads for this Powder".More about this powder:IMR End. spitzer boat tail & imr 4166, 223 80 gr bullet imr 4166, 223 load with imr 4166, 243 barnes 80 gr ttsx imr 4166 load data, 243 barnes 80gr ttsx imr 4166 load data, 243 barnes ttsx with imr 4166 load data, 243 barns ttsx with imr 4166 . Site Notices. Menu & Links It's been over two years of this ammo & reloading nightmare. For example, variation in velocity does NOT appear to be linear across the full range of temperatures. It is an extruded powder with a perfect burn speed for cartridges like 308 Winchester, 7.62mm NATO, 22-250 Remington or 257 Roberts, among other cartridges. This propellant performs comparably to Hodgdon Varget but charge weights are materially different. I bought all three. . It is a true magnum cartridge propellant with outstanding performance in such cartridges as the .300 Winchester Magnum, 7mm Remington Magnum, .338 Lapua and more. Expensive compared to varget. So far IMR4166 has worked great for me in the .243 Winchester with light bullets, the .257 Roberts with 75-100 grains bullets, .308 Winchester with 150's and 168's, the .303 British, 8x57 and .45-70 with "low pressure" loads. It may be that if I did more load development I could close the gap. I hope to get to .5 moa consistently anything better will be nice. The kid's rifle didn't like this powder, but perhaps yours may. Love the copper fouling eliminator makes cleaning a breeze, Posted by Paul rosenkranz on Nov 9th 2021. for 223. IMR now offers four Enduron powders that cover a broad range of burn rates. I tried 4166 and my groups opened up. _gaq.push(['_setDomainName', '.accurateshooter.com']); Generally no two rifles will like the same exact load. this stuff is not affected temp at all. This is a true magnum propellant yielding outstanding performance in 6.5-300 Weatherby, .264 Win Mag, 28 Nosler and .300 Rem Ultra Mag, among other cartridges. In today's shooting you can clearly see the scatter that centers at 45.5 and the obvious OCW at 46.2. Final diagnosis: This powder is certainly a winner in the accuracy field, and if the cleanup continues to be this simple it is sure to find a home on my reloading bench. var ga = document.createElement('script'); ga.type = 'text/javascript'; ga.async = true; Find load data for IMR 4166 Enduron propellant by clicking the button "Loads for this Powder".More about this powder:IMR Enduron 4166 is a versatile, match-grade propellant, with the fastest burn rate in the Enduron line. I can imagine you might have a little more difficulty with case volume and fill ratio due to kernel size. Copper fouling should be minimal, allowing shooters to spend more time shooting and less time cleaning a rifle to retain accuracy. I don't see any info for the A-Max though. IMR 4451 Another new Enduron powder that gives top performance in the venerable .30-06, 270 Winchester, and 300 Winchester Short Magnum, to name just a few. ), AR Issue 2022 Gun & Gear Giveaway Contest, Editors Choice Gun & Gear Giveaway Contest, Fall Hunting 2021 Gear & Giveaway Contest, Defensive Handgun Gun & Gear Giveaway Contest, Defensive Handgun Issue Gun & Gear Giveaway, The Hunter to the Hunted: Savage Arms Introduces New 110 Carbon, Wilson Combat 300 HAMR Barrel Conversion, 2022 Editors Choice Award Winning SIG Sauer P322 .22LR, 2022 Editors Choice Award Winning Savage Mo. 5 rounds shot Enduron powders are formulated to reduce fouling and to be stable across a wide temperature range. 2. FPS low 2735 high 2789. As with all load development, reference a credible reloading manual, then start at the minimum and work up in small increments. IMR 7977 has the slowest burn rate among the Enduron Technology powders. This propellant performs comparably to Hodgdon Varget but charge weights are materially different. First run tomorrow. IMR recently released a new line of powders with Enduron Technology which is also marketed to have extreme temperature stability. Shooters has been keeping it around $20/lb if you buy in quantity. 3, e-mail Hornady and the powder mfg. Learn more about Enduron powders at www.enduronimr.com. Really like this powder, the accuracy it produces is amazing I will lots more if I can find it. When placed and configured optimally, the LabRadar can measure muzzle velocity with +/- 0.1% accuracy, according to the manufacturer. I'm looking for some load data for the 55gr V-Max in 223 Remington with IMR 4166. Then Try IMR 4166 Powder", A couple seasons back, PrecisionRifleBlog.com (PRB) published a significant field test of powder temperature stability. We continue to prioritize our shipments to our traditional sales channels to maximize powder availability at retailers. Find load data for IMR 4198 propellant by clicking the button "Loads for this Powder".More about this powder:This fast-burning rifle powder gives outstanding performance in cartridges like the 222 Remington, 221 Fireball, 45-70, and 450 Marlin. I shot a 4.125", 10-shot group at 600 yds - well under 1 MOA and slightly better than my Varget loads, although they were close enough that I attribute the difference to the shooter. 110 PCS pistol, 2022 Editors Choice Award Winning Ruger 5.7 LC Carbine, 2022 Editors Choice Award Winning Mossberg 940 Pro Tactical 12-gauge, Fiocchi Introduces New 5.7x28mm Subsonic Ammo, Lehigh Defense 115-gr. The maxorder quantity of any powder SKU is, https://shop.hodgdon.com/sites/www/files/2022-04/2022-IMR%20Endurons%20SDS.pdf, https://shop.hodgdon.com/sites/www/files/2020-08/sell-sheet-imr-enduron-final.p. Trail Boss Reduced Rifle Load. It is equally effective in small-capacity varmint cartridges from 223 Remington to 22-250 Remington, and it's a great 30-30 Winchester powder. First load. IMR now offers four Enduron powders that cover a broad range of burn rates. var ga = document.createElement('script'); ga.type = 'text/javascript'; ga.async = true; Hodgdon's excellent online reloading data show only IMR 4007SSC, IMR 4166, IMR 8208XBR, and Hodgdon CFE 223 breaking 3,750 fps with a 55-grain bullet in a 24-inch test barrel. Hodgdon Extreme Series powders have attracted quite a fan base, with over 90% of the top shooters in the Precision Rifle Series choosing to run one of those powders. PRBs testers talk about those things, provide a few other insightful views of the data, and discuss tools that can help you manage temp/muzzle velocity in the field in their full post. IMR powder has long been a choice powder for knowledgeable reloaders. It is formulated to reduce fouling and to be stable across a wide temperature range. First load. This powder is comparable to Hodgdon H4350. Will purchase more. Then Try IMR 4166 Powder, Powder Temp Stability IMR Enduron vs. H4350 and Varget, http://precisionrifleblog.com/2016/06/19/powder-temp-stability-hodgdon-extreme-vs-imr-enduron/, Powder Temp Stability: IMR Enduron vs. Hodgdon Extreme, Guide to IMRs Enduron Powders What You Need to Know, Powder Valley has new IMR 4166 Powder in Stock, IMR Introduces New Enduron Powders: 4166, 4451, 7977. forum.accurateshooter.com/threads/imr4166-loads-for-223.4053707/, Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/103.0.0.0 Safari/537.36. Youll also find official load data in the Hodgdon 2020 Annual Manual. Across the board, the Enduron line is very insensitive to temperature changes, which is important for both match shooters and hunters. PrecisionRifleBlog.com (PRB) recently published results from a field test PRB conducted to quantify the temperature stability of the popular Hodgdon H4350 and Varget powders and compare those to IMRs new Enduron line of powders, specifically IMR 4166 and 4451. ga.src = ('https:' == document.location.protocol ? The maxorder quantity of any powder SKU is. Varmint shooters with small-bore cartridges love it. Ive heard some say 4166 is similar to 4064, which I haven't used or have on hand currently. IMR 7977 is comparable to Hodgdon H1000. so I am thinking till powder does come available, load one or 2 levels under Max for a 223 into the 556 cases. Shooters will find IMR 8208 XBR yields max velocities and 'tack driving' accuracy. Its loading density is perfect for magnum cartridges and contributes to superb uniformity, yielding outstanding performance in 300 Winchester Magnum, 7MM Remington Magnum and .338 Lapua Magnum. Sounds familiar! IMR 4166 + 55gr V-Max in 223 Rem tailbon3 Jan 19, 2017 Help Support Long Range Hunting Forum Become a supporting member tailbon3 Well-Known Member Joined Aug 24, 2009 Messages 84 Jan 19, 2017 #1 I'm looking for some load data for the 55gr V-Max in 223 Remington with IMR 4166. First, these powders all feature chemistry that reduces copper fouling. _gaq.push(['_trackPageview']); Testing consisted of a single 5-shot group of each incrementmental charge weight just to get a rough feel for the potential of this powder. I understand this is an old thread, but want to reply anyway, 243 75gr V-Max loads using StaBall or IMR 4166. It is also outstanding in cartridges like the 444 Marlin and 7.62 X 39. It is an extruded powder and is perfect for cartridges like 270 Winchester, 30-06 or 300 Winchester Short Magnum, among others. .223 Rem. Assuming all other environmental conditions remain the same, an increase in air temperature will cause a flatter trajectory due to a lower air density (easier for the bullet to cut through the air). IMR 4955 is a medium burn speed powder, falling in between IMR 4451 and IMR 7977 in burn speed. IMR 4166 is one of the new Enduron family of propellants. Find load data for IMR 4166 Enduron propellant by clicking the button "Loads for this Powder". Good luck. 'https://ssl' : 'http://www') + '.google-analytics.com/ga.js'; View Product Warning DEALER LOCATOR It is an extruded powder with a perfect burn speed for cartridges like 308 Winchester, 7.62mm NATO, 22-250 Remington or 257 Roberts, among other cartridges. of Varget. This propellant is ideally suited for many mid-range burn speed cartridges. IMR 4166 is one of IMRs Enduron family of propellants. . Find load data for IMR 4831 propellant by clicking the button "Loads for this Powder".More about this powder:IMR 4831 has a slightly slower burn rate speed than IMR 4350. bolt reload data with 65gr. Trail Boss is based on new technology that allows very-high loading density, good flow through powder measures, stability in severe temperature variation, and, most importantly, additional safety to the handloader. Sign up to get updates and access to exclusive promotions. Some of our Forum members have reported excellent results with IMR 4166 in cartridges that work with Varget, such as the 6mmBR, 6 Dasher, 6.547 Lapua, and .308 Win. A versatile, match-grade propellant, IMR 4166 is comparable to Hodgdon Varget. IMR Legendary Powders now offers four (4) Enduron powders: IMR 4166, IMR 4451, IMR 4955, and IMR 7977. So they would likely show much larger swings than what these four top-performing powders showed. It is available right now at Midsouth Shooters and Powder Valley in both one-pound and 8-pound containers: For more information and LOAD DATA visit IMRpowder.com and navigate to the Hodgdon Reloading Center. Guide to IMR Enduron Powders Temp Stable, Reduced Fouling, IMR Introduces New Enduron Powders: 4166, 4451, 7977, Guide to IMRs Enduron Powders What You Need to Know, IMR Enduron 8133 New Slow-Burn-Rate Magnum Powder, IMR Powders introduces IMR 4955 Enduron Powder. $40.99 - $270.99. OAL 2770 Sierra Case It is an extruded powder with a perfect burn speed for cartridges like 308 Winchester, 7.62mm NATO, 22-250 Remington or 257 Roberts, among other cartridges. Loading density is perfect for magnums, contributing to superb uniformity. You are using an out of date browser. First ladder turned out great! IMR 4166: This newer propellant produced by General Dynamics in Canada had the best temperature insensitivity and may be the best substitute for Varget across a wide temperature range with 77 to 80 grain bullets. These new powders should compete directly with the Hodgdon Extreme Series, which gives shooters more temp-stable powder options to consider. Each of these are still favorites with handloaders today! JavaScript is disabled. Grab some at your nearest dealer, or for more information, contact IMR Powder Company; Tel. Newtosavage Dec 9, 2020 #9 ericwh Well Known Rokslider Joined Mar 9, 2017 Messages 479 Location PA Powder Temp Stability: Hodgdon Extreme vs. IMR Enduron They are suitable for a wide variety of cartridges, from small varmint cartridges all the way up to the .338 Lapua Magnum. IMR 8208 XBR is accurate, clean-burning, and offers good velocity. It is an extruded powder with a perfect burn speed for cartridges like 308 Winchester, 7.62mm NATO, 22-250 Remington or 257 Roberts, among other cartridges. The main features of the Enduron series are copper fouling eliminator, insensitivity to temperature changes, ideal loading density and being environmentally friendly. Load data for the new IMR 4166 was taken from Hodgdon's 2015 Annual reloading manual, and in increments of .3 grains or less, loads were worked up from 24.0 through 25.1 grains of IMR 4166. I was planning to switch to 4166 for my .308, but it seems that it has also become nearly impossible to source. [ARCHIVED THREAD] - IMR 4166 .223 Rem. Be Alert: Publisher cannot be responsible for errors in published load data. Moving on, the individual loads were fired and the barrel was allowed to cool between each group. With Varget so hard to find, if IMR 4166 proves accurate (and available) we might see many .308 Win shooters make the switch. 5 rounds shot When I hit that node It's going to be great. Powders include IMR For magnums with light- to medium-bullet weights, IMR 4350 is the best choice. OAL 2770 Sierra Case I live in florida and shoot the same load all year. * All prices incl. This is a true magnum propellant yielding outstanding performance in .300 Winchester Magnum, 7mm Remington Magnum and .338 Lapua Magnum. var _gaq = _gaq || []; Choose a IMR powder and find the respective load data for it. Anyone seen/tried this combo? More about this powder: IMR Enduron 4166 is a versatile, match-grade propellant, with the fastest burn rate in the Enduron line. 7977 is the slowest of the batch, for shoulder thumpers like the .338 Lapua and the .470 Nitro Express. _gaq.push(['_setAccount', 'UA-6323545-2']); of 4166 in Peterson SRP brass topped with 168 gr SMK's seated 0.010" off gave me great performance. Clean and inspect the cases, lube and full-length resize/decap, clean, and inspect them again. .308 Winchester (IMR-4166 Data) Warning! DuPont had historically been a major supplier of military propellants long before becoming one of the handloaders favorite powders. worst groups at .5 moa most groups around the .3 moa mark. Fired from My Rock River Arms National Match upper, these rounds consistently fetch accuracy in the .75 to 1.25 MOA area. So they would likely show much larger swings than what these four top-performing powders showed. To be able to use the full range of Shopware 6, we recommend activating Javascript in your browser. .45 ACP and .38 Super, while their rifle offerings range from .223 Remington to .30-06 Springfield. Sep 25, 2010 . Load . Minuteman. This is a true magnum propellant yielding outstanding performance in 6.5-300 Weatherby, 264 Win Mag, 28 Nosler and 300 Rem Ultra Mag, among other cartridges. I have had good luck with 4166 in .223 bolt rifles. The test was designed to quantify the temperature stability of Hodgdon H4350 and Varget powders compared to IMRs Enduron line of powders, specifically IMR 4166 and 4451. Third, Enduron powders are designed for optimal load density. (SEE: Temperature Effects On Zero on KestrelMeters.com.). You may not reproduce original text or photos without advanced permission in writing. very consistent in .243 shooting 65gr vmax and 3550 fps. IMR 4166 Enduron Find load data for IMR 4166 Enduron propellant by clicking the button "Loads for this Powder".More about this powder:IMR Enduron 4166 is a versatile, match-grade propellant, with the fastest burn rate in the Enduron line. Most powders arent specially formulated to be temperature stable. then consider IMR 4166. Hodgon VARGET, IMR 3031, IMR 4064, IMR 4166 Enduron, IMR 4831, IMR 4895, Lovex D073.6, Lovex S060, . . IMR Enduron 4166 is a versatile, match-grade propellant, with the fastest burn rate in the Enduron line. Select 223 Remington, check off your weights, select IMR, then 4166 I was able ti find a load for two different 55s, a 69, and a 75. IMR 4955 is a medium burn speed powder, falling in between IMR 4451 and IMR 7977 in burn speed. Hodgdon Varget was the second least temperature sensitive powder in this test, with 46 fps of variance in muzzle velocity between temperatures of 25 F and 140 F. IMR 4166 performed very similar to Varget, and proved to be fairly insensitive to large swings in temperature. The same increase in temperature also causes the nitrocellulose-based powder inside the cartridge to burn at a higher rate, producing approximately four times the Point of Impact (POI) shift than just air temperature alone. IMR 4166 is part of their new Enduron line that launched just a few years back. IMR claims that Enduron powders are not sensitive to temperature changes. For example, IMR 4166 is a good replacement for Hodgdon Varget (commonly used in the .223 Rem, 6mmBR and .308 Win), while IMR 4955 is a fine substitute for H4831 (favored by F-Open shooters for the .284 Win and 7mm WSM cartridges). The main features of the Enduron series are copper fouling eliminator, insensitivity to temperature changes, ideal loading density and being environmentally friendly. - 24hourcampfire Previous Thread Next Thread Print Thread Hop To BP-B2 IC-A B3 IC-B B4 RR1-22 Who's Online Now 828 members ( 10Glocks, 12344mag, 007FJ, 1911a1, 1100mag, 95 invisible), 2,340 guests, and 1,313 robots. For more information, go towww.P65Warnings.ca.gov. One member wrote: in my 6.547 IMR 4166 gives speeds and accuracy pretty much exactly the same as Varget. And other shooters have observed reduced copper fouling with Enduron series powders, so IMRs Enduron anti-fouling chemistry does seem to work. Or maybe have QuickLoad data? It is an extruded powder and provides top performance for big game cartridges like 25-06, 270 Winchester, 280 Remington and 300 Win Mag, among other cartridges.