there is number 7 buck....closer to .22 calibre and 27??? pellets per load Vs 00 buck normally 9x.32 calibre there is also another load with normally 12x.30cal balls not sure if thats 000 or not???.
you will find the loads that are close to 3" unfired are roll crimped so they dont have stickyout bit when fired to jam charge in forcing cone.rio make a steel shot load the same.
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