If limited to only one, I would choose Unique.
Not the absolute best choice for small capacity cases (9mm and under) and not the choice to get maximum performance out of big magnum cases, but it works tolerably well over the entire range of sizes. Also has the physical bulk to make a double charge obvious in a large case, and overflow a small one.
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I have a pound or so of Win 231 but doubt if I have enough
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With a pound being 7000 grains, and MAX charges of 231 being under 4gr in .380, under 5gr in 9mm, and under 6gr in .45acp, that pound of powder is enough for well over 1,000 rounds, and closer to 2,000 with lighter charges.
No, you don't have enough!
