The SX has a very thin jacket and will actually disintegrate if you try to push them too fast. I loaded some years ago too fast for my 222 Rem and when they left the barrel they would just come apart. I don't recall what the speed is but if I remember right it used to say on the box or maybe in the Hornady reloading manual.I have shot many coyote(red fox,raccoon,skunk, opossum and ditch cats) with 223 and 50 gr SX bullets, don't recall ever losing one. By the name, I would think the 2245 would be less "explosive" than the 2240.