According to that test, it looks like the powder was fully burned and muzzle velocity optimized at 24″ for the 6.5 Creedmoor with 142gr SMK bullets and H4350. As I mentioned in some other comments recently, I shot 5 different cartridges/loads over all 3 of those chronographs. But how many vary the muzzle velocity by temperature? jlow & Rick I chambered one of the special handloads I'd developed six months earlier and shot at my 400-yard gong. Your muzzle velocity WILL vary based on ambient temperature, regardless of what powder you use. Each case was then sized using a Whidden Gunworks Full-Length Bushing Die. If you work a load up when it is cooler outside,you may have high pressure problems when it is warm. At this point, you’ve got me wondering myself … so let’s walk through it. Thanks for the reference. Your blog has gained my trust 100% and I figured asking you would be a great place to start. The same is true for LabRadar which is to set up to the right or left of the rifle, thus it is at an angle to the bullet path. Having shoot RL17 in a tactical .284win over past 3 years and from 5°C – 30°C i can say its quite sensitive to temperature change , but suprisingly consistent in regards to SD and ES, I also used RL 15 in my 6.5×47 F class gun but only in 20-30°C where it proved far less temperamental than Vihtavouris N540 or N550, RL 17 is made by Nitrochemie and sold in Europe as Reload Swiss RS60. Hope it helps you get more rounds on target. Here are the results: So that’s a difference in POI of 15″ at 1000 yards, just from leaving the round in the chamber for an extended period of time. Canister powders are developed so they can be used for many applications. 2) Read Litz’s Applied Ballistics For Long Range Shooting book – This will give you a great foundation to not just ballistics, but things like making sure your scope is setup correctly, how to select the best bullet for your application, and a bunch of other very helpful stuff. There are a multitude of shooters using H4350 and Varget in their 6.5×47’s with awesome results. They called it gun powder. Honestly, there wasn’t a clear way in my test to know which one was right … so it’s somewhat blind faith that makes me believe the LabRadar was the one that was closer to right. Powder sensitivity chart. Sorry – that wasn’t clear – I meant Varget = 2008 and H4350 = 2209. But I think if you asked a statistician, they might be the kind of “purist” answer you’d hear. Hey guys, you’ll probably want to download this Powder Burn Rate Table issued by Hodgdon/IMR. During a second range session, however,  the bullets landed up to 6 inches apart at 50 yards. Heating it that much expands it significantly also. Maybe 90%. I seated the Berger 140gr Hybrid bullets using a Whidden Gunworks Bullet Seating Die, which have proven to provide very consistent and repeatable seating depth. Performance is inevitable with this propellant, designed for mid-range burn speed cartridges. And here is one more view of the results, which shows how much the average change in muzzle velocity for every one degree of temperature change across the full range of temperatures. I’d imagine that even if you left the round in a chamber that started out at 149° F, the gun powder would likely never heat up more than the 140° F … because barrels start to cool fairly quickly. That being said I think the premise of this test was to test the most common powders used in the top 100 of PRS competitors. If I were to make a suggestion, it would be to establish an archive containing the full description of the experiments and the results. Trijicon Ventus: Measuring Range AND WIND! Look at the velocity differences in the chart I posted in the comments. I two other OCD handloaders that I’m good friends with run through the same experiment. The loads were not tuned to an accuracy node for the test rifle. Let me quickly run through the setup of how the test was conducted. Interesting Test. At 105% fill APB is 95% but compressed loads can cause seating issues. Add 4″ of barrel and H4350 would be the ideal powder. I hadn’t ever seen that. Great question. But I didn’t do that in these tests. Go. That’s fun for me, but it just limits the value you add to the shooting community as a whole. It is a key, directly measurable indicator of explosive performance, but depends on density which must always be specified, and may be too low if the test charge diameter is not … Patrick has become a good friend of mine (Cal, the author of PRB), and he mentioned wanting to do a powder test. As always, excellent topic, research and article. It also gives you a chance to watch other people who are really passionate about the sport and see how they’re running their gear … and maybe even get to try it out before you sink money into it. They were very, very close … so it didn’t really matter much. And I totally agree about the standard error bars. thomis, I think any rifle powder is sensitive to temperature change. Reloading Depot . SHOT Show 2018: Really Right Stuff’s New Products, Online Precision Rifle Training from Top Shooter, Jake Vibbert, Extreme Long Range Tips 2: Spotting Shots & Ranging, Wyoming ELR Scopes & Mounts – What The Pros Use, Extreme Long Range Tips 1: Optics & Mounts, How To Measure The Distance To The Lands On Your Rifle Barrel, Precision & Group Size – Statistics for Shooters Part 3, Muzzle Velocity Stats – Statistics for Shooters Part 2, How To Predict The Future – Statistics For Shooters Part 1. new line of powders “with Enduron Technology, Temperature Effects On Zero on KestrelMeters.com, Kestrel Elite Weather Meter with Applied Ballistics, Darrell Holland’s Long-Range Shooting School, Litz’s Applied Ballistics For Long Range Shooting book, Modern Advancements in Long Range Shooting: Volume II, http://rifleshooter.com/2016/02/6-5-creedmoor-effect-of-barrel-length-on-velocity-cutting-up-a-creedmoor/, http://precisionrifleblog.com/2015/04/28/how-much-does-muzzle-velocity-matter/, https://kestrelmeters.com/blogs/news/3457002-temperature-effects-on-zero, great paper written by an OU professor on “The Myth of the 3 Shot Group”, Statistics for Shooters – Executive Summary, Tactical Scopes: Field Test Results Summary & Overall Scores, American Sniper Rifles: 5 of Chris Kyle’s Favorite Sniper Rifles. One thing you might notice in the chart above is that the variation in velocity does NOT appear to be perfectly linear across the full range of temperatures. So for a long time now I have sworn off RL powders with the exception of RL 15 that I use in my 375 h&h and 416 rem. While H4350 was better in the higher regions. That is an interesting idea about the post-muzzle acceleration, but it seems like those guys may have corrected for that in the software. SSL. So I decided to test 4 different powders that are ideal for the majority of calibers used in long-range, PRS-style matches: A change in temperature can affect the trajectory or ‘flight path’ of the bullet in two well-known ways: Just how much does an increase in temperature affect the powder burning-rate? While I do try to use sound testing methods that would satisfy most professional researchers, ultimately, I’m not trying to write whitepapers that can only be understood by the engineers among us. Muzzle velocity also sometimes dropped closer to 200 fps. Twitter. 1 – Density of air I was fortunate enough to perform the test in style, with a full TS Custom rifle build that a friend let me borrow. It looks like someone copy-and-pasted it in from another source and the images weren’t included. containers. In fact, from time to time we have seen an inversion of the powder temperature – muzzle velocity relationship for a particular lot of powder where the muzzle velocity actually decreased as the powder temperature increased. Many said they had used older powders like IMR-4350 in cold weather for decades and had never seen any difference. Even relatively temperature-sensitive powders are better than they were a century ago, and they work fine for hunting between freezing and 85 degrees. IMR Powders – Enduron 4451 Powder. I use a ton of it myself in my 6XC and 6.5 Creedmoor. Hey, Dan. Bryan specifically cited Hodgdon Extreme Series powders as one of the least temperature sensitive powders he’d used. As most reloaders know, there are powder weights that produce both precision and low SDEV but also weights that produce one or the other. They suggest you place the Doppler beside the rifle, and it seems like they could account for that offset as they interpret the results and correct for it. I wanted to see the differences between N135, IMR8208, H322, and Benchmark. And generally compressed loads do not get a complete burn. It will also help you put into context how much different elements matter. That is very, very low. A few months ago, I shot 100 rounds through 3 chronographs: the LabRadar, MagnetoSpeed, and Oehler 35p. Facebook. Thanks for sharing these results. I did wonder a bit about the methodology leading to conclusion that changes in temperature of the scope alone had no significant influence on zero shift. Not a lot of easy answers in there though. But it’s only valuable if you have good data to support it. They call and uses black powder cartridges not supposed to use modern smokeless powder. I haven’t ever heard someone mention that before. Just wondered if this affected the results posted. Temperature sensitive powders chart or list. Cal has an engineering background, unique data-driven approach, and the ability to present technical information in an unbiased and straight-forward fashion. But, you can minimize the effect by making a wise powder selection. There are probably a lot of lessons we could learn from that side of the precision rifle world. I have an interestng BDC turret wrap design from my scandinavian friends and it spans from -20 to +20 for Lapua military sniper ammo any variation is staggering once you get past 500m or so.m, http://www.strelec.si/forum/attachment.php?aid=5108. And it varied up to 10 fps or more from the other two devices. Testing reveals things ar enot linear for many powders , some have certain temp ranges where nothing much happens and then a steep drop or climb ,you might avrage that but its not real. It is an interesting point, and a compelling case for hunters to develop loads based on Varget. I personally hunt with a 7mm Rem Mag (aka God’s hunting cartridge ), so I wonder if H1000 or Retumbo exhibit similar properties. I just bought an annealer, and seriously wish I would have read it before I made that purchase. I read somewhere the Army found muzzle blast influence in artillery to be done in the first 11 calibers beyond the muzzle, but don’t recall learning the barrel length(s) in calibers or peak-to-muzzle pressure ratios they found it for. We don’t have plans to test any other powders at this point. In 3 of those cases the average muzzle velocity of the LabRadar was faster, in the other 2 the MagnetoSpeed was faster. It’s blind faith either way, because I can’t really think of an affordable way to figure it out. This is why ammo manufacturers develop non canister powders exclusively for certain cartridges to maximize its performance in factory loaded ammo. There is another test I may have to go out and shoot one day. Early Cordite, the spaghetti-strand British “powder,” burned so much hotter in warm temperatures that factories often loaded ammunition with two different charges; one for shooting in the relatively cool climate of merry old England, and a “tropical” load with less powder for the warmer portions of the Empire. We have VV and Bofors (they produce for norma and many others). The answers, or at least the questions, become very technical very quickly. Sorry for not reading your post more carefully. The Oehler was 20-30 fps slower in all 5 cases. I definitely agree with you to a point. Bolt action barrels just don’t get near as hot as other barrels. 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