JCS, If you are asking about 223 v-max rounds. I use 53gr v-max and CF&E powder. Howa rifle-Vortex scope.1/10 twist? I shot many coyotes this year with this combo. None of them when over 30 yards, most folded with the shot. Shot one yesterday at 350 yards. I shot over it on the first shot at 200 yards. I thought it was farther away than it really was. It went the 30 yards (hit it a little far back)