I have read your post and agree with everything you said.

You like Taylors formula, well here is a little known formula you might like better. Game weight = impact energy x sectional density x bullet area x 25.

Let's look at an M16, at 100yds its energy is about 1010ft/lbs, SD = 0.161, area = 0.039. This gives 158lbs.

__IF__ a quartering shot is made use 18 for a multiplier.

__IF__ the game is dangerous the multiplier is 12.5. This means that for game of the hoofed variety the target should weigh between 114lbs and 158lbs.

__IF__ a wolf saw you first and charged lets hope it doesn't weigh more than 79lbs

If you use this formula on a Reminton double derringer you get about 25 which is unlikely to stop a determined attacker unless you hit that 15%.

ps. Most of these formulas take for granted that you have the right bullet for the job in hand.