Yes, my understanding is that a special reamer is required.that's because they didn't have the two matched correctly (chamber and brass) or the brass really wasn't process correctly by the shooter.. i use alpha brass in a non alpha chamber.. i have no issues with it.. just gotta do your set up correctly.. if ya don't.. you'll run into trouble .. pretty simple really..

Alpha Legacy 6 BRA Reamer .120
Alpha Munitions Legacy 6mm BRA Reamer .120 Freebore Performance Legacy reamers are the most consistent reamers available. All key dimensions on our reamers are guaranteed to be within 4 microns or 0.0001574803” with a majority falling within 2 microns or 0.0000787402”. This means the reamer...