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Message: <blockquote data-quote="rc508pir" data-source="post: 3005897" data-attributes="member: 40091">I'm betting that your rifle is under gassed for that 62gr Champion stuff.  Dissapator rifles have that problem a lot.  The gas port is to close to the muzzle.  Once the bullet leaves the barrel the gas pressure is dropping off enough to cause the short stroking.  The gas port is most likely just wide enough to push the 55gr bullet through but not quite enough to push the 62gr through.  That gas port should be in the .08 to .09 size range to operate heavier rounds with a normal weight BCG.  Take it to a smith and find out what the port size is.I'm betting the gas port just needs to be opened up some to function with heavier bullets.  The smith will cost you less than getting a new low mass BCG</blockquote>