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I hope I don't offend anyone with this post. I believe theory and practical experience are two different things. I have seen a lot of animals shot with subsonic 220gr match bullets. They are not for body shots in my opinion. You are risking a lost animal that will die a slow death in most instances if you do. Think of a knitting needle pushing flesh aside as it pokes a hole through. It does not cut a hole as much as it pushed one. One of the biggest problems is that all that terminal energy is lost due to over penetration. It doesn't dump enough energy into the target and is wasted out the other side.
If you take a Sierra 125 or similar 30 caliber spitzer bullet, they are often designed to come apart at high velocity. They are not designed for hunting deer when shot from a 308, 30-06 etc. But when you shoot them from a relatively slow 300 Whisper in the 2200 to 2400FPS range, they expand and act like a game bullet should on game. On a simple chest shot, they will perform similar to a 30-30, 308, 30-06 etc. I've seen good expansion and a nice exit hole but not explosive results.
For a relatively slow subsonic bullet to perform best on body shots, you will have the best results with a heavy, larger caliber, flat tip bullet like the 45 colt etc. For 30 caliber subsonic 220 match bullets to perform best on game, you need to aim for a head shot or simply pass on the shot- in my opinion. These 220 subsonics can be very accurate out of the proper barrel. If you do your homework at the range using field shooting positions for practice (instead of just a cement bench at exactly one set yardage), you will know your limitations.
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