Shot my Ruger 1022 with my new GM .920 18 inch bull barrel yesterday for the first time. I shot the first 100 rounds using Federal plinking ammo, following the GM's recommended break in procedures. During the initial 100 shots of break in, I experienced about a 10% failure to eject properly and a few stove pipes. After the break in, I attempted to shoot Aguila Super Extra 40 grain 1255 FPS and those cartridges wouldn't even chamber properly. Then I moved to CCI SV and Norma TAC and both of these preformed flawlessly. I know you can't shoot stingers out of a bent chambered barrel, but didn't expect issues with the Aguila.