Dear Sir I am having a problem with my Colt Match Target Rifle Model MT 6601 after firing between 5000 and 7000 rounds it developed a problem of failure to eject the spent brass from the chamber. The extractor does not damage the brass but pulls over the rim. I have installed new spring O-ring and extractor. The ammo I am using is my reloads using Remington brass Full length sized with 55 V-max bullets. Since the rounds chamber just fine I have not tried small base dies. I clean the chamber every time I clean the gun using a chamber brush and am at a loss as to what to replace next. I have also fired Wolf ammo and S&B with the same problem. Normally it will stick a case after 60 to 90 rounds have been fired. The problem developed within the last 1000 rounds being fired Any help would be appreciated Thanks Randy Wanna kill these ads? We can help!