you have to force,,or at least use more force,, to get the bolt home,,,,but only after 300+ rounds,,,,only used a bore snake, so while your bore was cleanish,, your chamber was most likely dirty,,,most rifles today have clearance to accept most if not all store bought ammo ( don't want to get sued) but if you have crud in your chamber the shoulders of your bullet may be getting squeezed as you load and then when you fire it will expand more so that it will be jamming up so that you cant eject. just my 2 cents