Big bullets, I think you will find that most factory .44 mag ammo will chronograph about 1100 to 1200 fps these days. I had 4-5 boxes of Remington that were from 1956, 250 gr. 3/4 jacket LSWC that I got with a Ruger 7 1/2" Super Blackhawk. Those would chronograph an honest 1450 fps but most...