I have done it on a few solid frame barrels,making them fit a takedown receiver. the differance is in the barrels. Basically you are removing metal where the barrel meets the receiver,and where the chamber end butts up against the loading ramp area.I never actually measured the amount but it was minimal maybe.005. when you do this you are tightening the chamber toward the bolt face creating less headspace. i have only did this on rimmed cases and had no trouble closing the bolt on the barrels.Don