One example of this is in the accompanying data for IMR-4350, where it shows far more cold resistance in the 300-grain load used in a Mark X .375 H&H, but not nearly as much in the NULA .30-06 with 165-grain bullets. Here’s what Patrick said in the article: I loaded each case at what I knew would be a mild to medium load, in order to avoid pressure spikes. I bet you will be too. Thanks for the assessment and information cal. The goal of this field test was to quantify the temperature stability of the popular Hodgdon H4350 and Varget powders and compare those to IMR’s new Enduron line of powders. This is one example of why I prefer the term “resistant” to “insensitive.” I’ve yet to find any powder that doesn’t gain some velocity at temperatures above 85 degrees, though with temperature-resistant powders the gain is much less than with conventional powders. The self funding of Cal’s research and Trump’s candidacy seem to both be coming to their limits. Here is an interesting article I read recently on barrel length and a 6.5 Creedmoor, which has a very similar case capacity: Thanks to a reader named Pete Wilkinson, I obtained a box of early Remington ammunition loaded with the Swift 400-grain A-Frame and compared it to a recent box of the same load, doing the test shooting on a 95-degree August day with the ammunition warmed up to 110 degrees. I probably won’t have time to do that until closer to hunting season, so you might test yours and see what you think. On the other hand, many rifles don’t always change 100-yard POI, even when muzzle velocity changes considerably. I think there was some interference, and I’m sure I could figure it out if I spent the time on it. I didn’t know the answer to your question, so I pass it on to Patrick. This kudu was taken with a .30-06 using Reloder 19 and a Nosler 180-grain Partition. Thanks for sharing. Its all about burn rate. Both loads lost well over 100 fps, but for some reason the 130-grain load still landed in the same place as it had at 70 degrees (though it didn’t group nearly as well) while the 150-grain load shifted its POI 3 inches to the right. At the end of all this, I had a box of 25 loaded rounds of 6.5×47 Lapua ammo for each of these powder charges: 10 loaded rounds from each group were brought down to 25° F by placing them in an iced down cooler (mixture of dry and regular ice). chamber is 140 degrees and the ammo is ambient temperature). Not now after reading your article. I’d love to see the full report. That is funny! Many ball powders will burn at lower temperatures, which should extend the life of a barrel. I’m looking for a good comprehensive source of data on gunpowder, showing temperature sensitivity and burn rates. The results are included in the table, but it turns out my suspicion was correct. I did see my BC improve slightly by pointing. Thanks Uncle Ed. The ultimate experiment would be to shoot 3 of them like that, and also shoot over a 12 foot Oehler or one of the commercial-grade chronographs like Bryan has. I rarely see a significant different in SD from 10 shots to 50 shots. If you have a really good rangefinder, you can do a really good drop test (at least as good as possible for a drop test). There were also more PRS competitors within the top 100 finishers using the 6.5×47 Lapua than any other cartridge (see the data). Once again thank-you the work that you do. All the ambient. A quality long-range class is like that. The LabRadar is a new type of device that allows you to measure muzzle velocity within at least +/- 0.1% of the reading. But alas there was a problem in hodgdonville I could not get … I waited 10 minutes between the strings. In the early days of the 20th century, when cordite was the propellant du jour, the reputation of cartridges was made and/or broken based on their performance in the heat of the tropics. It’s literally been years. As I understand it, H4350 and Varget are actually made by an Australian company. Luckily the doe had been facing to the right, so other than losing some shoulder venison, no harm was done – though meat was obviously the primary reason for filling the antlerless tag. It’s an interesting problem, but I’m not sure you could do much about it … even if you did quantify it. Difference with the point home this test really does provide everything you need for an answer few shots as,! 5-30×56 with PRB Reticle lower temperature range is a significant difference degree of simplification that one should go it! Left would lower the displayed speed, 37.5 grs Varget 99 % FR, 99.9 %,... 6 inches to the test was to quantify how much different elements matter as hunters go anyways detail. Part of the results are last on this topic teens to low single throughout. Another Australian powder that you ’ ve never heard of anyone using primers! 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