Im a .223 fan here too, about your bullets there, copper seems to have little effect to carbon plate,
now try that same shot with some SS109 mil spec 62 grn bullets, that little bullet at 3100 about? at
100 will make just 1 hole, like a metal punch made it! little to no expansion. Works pretty wicked on
a hogs head though, it must hit bone material to make any impression!
Not sure if you load or not, but try someday, some Nosler BT's in 55grn, great little deer round!
using it last 6 or so years, little meat damage.
hunt safe... (dry)
"Walk softly and carry a big stick!"