RL23 is supposed to be T insensitive. Alliant is coming out with a few, as is IMR.
I shot some 338's loaded with RL22 over a chrono last year that were supposed to be at 2850 MV. Bullets sat in the sun for a while. Chrono read 3100+ with pressure signs. It's a real thing. If you hunt in very...
Found that with both 19 and 22. I've switched to T insensitive powders where I can. Been working with IMR's Enduron powders some but I see higher pressure at relatively low speed.
I have the same issue on a 300 PRC. Hornady Match 225 ELD-M ammo. With Hornady being the only factory ammo it needs to shoot these. My Borescope showed more material up by the lands than I'm used to seeing. No sharp slope and cut off at the very beginning of them. No idea if this is good, bad...