W231 is one of the most versatile powders if you want 1 powder to serve just about every caliber OK and a few very well. HP38 is the same powder. It is position sensitive in large black powder cases like 45 colt but works great in 38 and smaller revolvers and low pressure autos like 45acp. It's OK in modern auto pistol rounds like 40 and 10mm for target loads.
Powders based on cartridge pressure?
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