Well I've got the 150gr Acubond averaging .567" groups @ 3015 fps. This is just 1/10" more than BTs do in this rifle. The way these Acubonds retain weight I'm thinking you could use a lighter weight bullet getting the same penetration as one step heaver. I've been using 165gr BTs but I'm now going to use the lighter 150gr Acubond in the fall. We'll see.
Billy