Yesterday I loaded up some test ammo for my .375 JDJ rifle. Using Lee's 250 grain flat point plain base boolit that casts out at 240 grains with 90-5-5 alloy. Started with H335 and Ramshot X-Terminator. 35.0 grains up to 37.0 in half grain increments. I will try other powders as well. Want to try IMR 3031 but don't have enough. Have been poring over powder burning rate tables.
Does anyone have any experience with this cartridge/bullet in a rifle? It may be a while before I can try them out. It snowed again this morning.