I thought my manual says no 3" shell but only use 2.5" shell. I got mine loaded up with Winchester PDX1 and it got some balls. I thought I'd try my 300gr xtp loads in but think its pointless and too much abuse. My favorite is 45 Clot Galley loads using 454 roundball and Trailboss. Light load but that roundball keals in close on vermins!