ya the biggest problem is the jackets for sure. they are really tough and overly thick for subsonic.
I shoot these @ 100 yrd. and they just poked strait thru a 4" thick by 12 wide wood beam. that I set against one of the 80 lb. metal plates that I shoot at for long range.
Totally NO expansion on impact what so ever. The 220 grain soft points just cruzed right threw and atomized the lead after the sudden stop on the steel plate. To just leave the jackets splayed-out and just laying there on the ground.
.
I also did up some HP's on the 20's and they left some lead behind but not much. I made up a few more a little bigger and will give them a try in a few days.
For some Gauranteed expansion and some Awsome FRAG, I think What I really need to do is just put a big honkin hole on top and shove a shotgun Primmer right on top for some FUN. ...
This Pic, is a good example of just how tough the jackets are
.