If you remove 1/4", that should eliminate the original crimp folds and leave you with a perfect hull for rolling. I do not have any data for the 12 gauge, so I cannot verify your load. Your payload of shot should be fine for upland birds. I use RST shells with 7/8 ounce of 7-1/2 shot in my composite barreled 12s. It is fine for the Ruffed Grouse. Good luck!
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GMC(SW)-USN, Retired
'Earnest Will'
'Desert Shield'
'Desert Storm'
'Southern Watch'
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