You will LOVE the A-Frames as far as penetration..in some calibers they can be a bit more finicky to get to shoot well--when I went from Scirrocos to A-Frames I switched to RETUMBO powder basically because I had read an article in one of my magazines stating it worked well--it did-and have used it ever since in the 300 Ultra-mag--good velocity and very accurate..

Ripp