I have used my M2000 for mostly sporting clays, firing 2 3/4 Remington gun club loads. I recently tried to some 3" remington express magnum buckshot (00) and Hornady magnum turkey loads. The turkey loads cycled great but the buckshot was a different story. One shell and the bolt would stick open. I had to force it closed. I only fired two shells of the buckshot thinking that something was wrong. I checked the manual and saw that it says the gun should fire any 2 3/4 and 3 inch shells. So I am defering to higher experience. I have seen the deburring and smoothing posts, is that he next step? I did notice the really rough finishes on the bolt and other moving parts while I was cleaning after the above mentioned situation. Ideas? Comments? suggestions?