Between 65-87 degrees I didn’t see enough change to care. Average was within 6 FPS.
@18* average was 27 FPS faster. Everything measured with the same mag speed with gun and ammo at ambient temps.
I do believe cartridge shape, capacity, primer, etc can and do change how different powders perform.
I have read over and over how temp sensitive RL 26 is on forums. Lately I’ve mostly been reading it’s unstable over 85*. Is that because the blend changed, people are actually testing it, it’s being used in different cartridges then when it first came out? Idk.
Hell I’ve read Retumbo is temp sensitive. Is it? Idk since I haven’t personally tested it or know someone that has.
I tested the RL 26 in a 7ss. CCI BR2, 180 ELD, 60 grains RL 26 for reference. I live in ND and it gets cold here and occasionally up to 100*. I’ve got a new gun to load for. I’ll test it again this summer and also when it gets cold out next winter. Hopefully I’ll have time to shoot in 20* increments from -20* all the way to 100* give or take a few degrees.
I’ve used it in other cartridges and haven’t had issues. I never tested them though. Lately I’ve been trying to record more data. I’ll probably try it in a 300 PRC with 215 Bergers and a 6.5SS with the 156 Berger.
Regards, Branden