Sweet can on the end of that thing!
I have shot rockchucks with the 75 gr v-max (can't remember if it was 200 or 300 yards) out of my AR15. The chucks died, but didn't explode like when I use the Calhoon
42gr DHP or 52gr DHP.
I found a load in a magazine a few years ago for the 77gr Sierra HPBT using Win748, starting load was 22gr, max 24.4gr, velocity 2736fps. This should get you in the ballpark.
[ 10-26-2004: Message edited by: gonehuntingagain ]