Im using them in a .223AI....currently shooting 55 grainers, which everyone tells me wont stabilize....H335 is the powder that gets the speed, and I expect that would apply to plain vanilla 223 as well.
Prior to this I was using the 50 gr. TTSX ( in case you are worried about the 55 not stabilizing) It was real easy to get it to shoot and I killed a bit of game with it, but only one coyote. Little hole in...little hole out.
It killed deer and antelope just fine out to 300 yards ( the longest I wanted to attempt...)
I wouldn't hesitate to use either on whatever you want to point it at.
