It would most likely be one cartridge to do them all and since 9mm is more popular than it's ever been in it's nearly 120 year existence, that would probably be the most widespread. There would be a good amount of .40 and .45 around too but for revolvers I'd say the 357 Mag and 38 special would the main ones with a good sprinkling of 44 here and there. I don't think 10mm plays much of a role at all, it's still widely uncommon. The .22 would be huge too, not real handy for big critters but not a bad option for most situations.