I think there's too many variables to make sometype of equation for what you're asking. I may be wrong. There are charts though as to recommended minimum ft/lb for given game. I've seen 1,000ft/lbs and 800ft/lbs for deer. I don't know about hogs. Here's what I do know...that guideline isn't the end-all be-all. A 55gr bullet in .22 diameter can produce 1,200 ft/lbs from a 22-250 or 220 swift...yet they won't penetrate a deer.