I load AA winchesters in 7/8 oz and occasionally in 1 oz. for my 12 gauge parkers. They have all measured 2 5/8 chambers with a rough gage. I have also measured and measured again AA spent hulls and to me they are consistently closer to 2 5/8 than 2 3/4. At 6000 to 7200 (1oz) PSI I experience no problems and 7/8 is nicer on recoil.
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