Shooting through deer is not much harder than shooting through a paper sack. My best friend's daughter has killed a few with a recurve pulling about 22-23# @ 22" with arrows around 400 grains. At least one of hers was a big doe at approximately 26 yds. She's not getting pass-throughs, but she is getting dead deer. She's using Beman ICS Junior carbon arrows and Ace 2-blade broadheads (125 grain). No idea what her KE, Momentum, or FOC is.
The key is good arrow flight, very sharp broadheads, and excellent shot placement. We haven't chronographed them, but I'd be shocked if she's getting more than 130-150 fps.
I believe it was Primitive Archer that did an article a year or three ago about penetration in a deer. The fellow who wrote the article used a fresh-killed deer, a very poorly made selfbow (his description--I think he made it) that was pulling around 40#, and stone points on wood and cane arrows. His results were impressive--plenty of penetration.
Hogs can be a different story--especially larger ones.
Chad