Two points to add, or possibly contrast with, Todd's post. The NSSA World All-Bore (12 gauge) championship has been won with 16 and 20 gauge guns. You don't need a 12 gauge load to compete at the highest levels of skeet. The same event has been won with side by side guns when over unders and automatic shotguns were also competing. A significant number of NSSA competitors hold a higher average in 20 and 28 gauge competition than they hold in the 12 gauge event.
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