I don't know about expansion/penetration, but RL17 should let you make 2,600fps+ with the 190gr Interlock. I worked up to 2,620fps with a 200gr Sierra BT in a 20" 700. It's a soft bullet for thumping whitetails, but it is still making 2,000fps at 400yds, which ain't shabby for a carbine with a big bullet and a little case.....
