I bought my R1 in .300wsm 2 years ago. It failed on me at the worse possible time. (in the middle of a herd of elk) I contacted the factory and sent it in after the season. They said they couldn't see what was causing it and replaced the barrel. I got the rifle back and re-mounted the scope and went to site it in this season. It worked fine for the 8 shots I needed to site it in. I went out yesterday to fine tune it (hunting season starts in 4 days) It jammed after 2 rounds. The shell would eject, but the bolt would hang up when the new round was trying to chamber. I came home and stripped it and found the piston all carboned up. My question is-what is the best way to clean this crap off the piston and bore? I see pits in the bore as many of you have stated. How many rounds can you actually shoot before you need to worry about this? I have to tell you , i am very dissapointed in this gun, it shoots nice (when it works) and looks good but if I have to wonder if it will work when I need it then it really isn't much good to me. I have shot a total of 40 rounds through this gun so far. Does the type of ammo matter, is some of it better then others for an auto loader> I am shooting Winchester Accubond ammo. I have heard nothing but good things about Benelli guns over the past 30 years so decided to buy 1, not sure I made a good choice here. Could have bought 2 brownings for the price.