George,
With all else being equal, i.e. weight of size of shot, shot hardness. cushioning of wad, velocity an so on, a larger bore will produce a more evenly distributed pattern. Allowing that three pellets in the vitals kills birds cleanly (same for humans) an evenly distributed pattern makes a larger bore gun more effective than a smaller bore.
The modern 3.5" 12 gauge allowed for a larger payload of the less dense than lead steel shot. It is in my never humble opinion as effective as an equal load of lead or soft non-toxic shot in a 2 & 7/8" 10 gauge.
Bigger bore equals a more effective pattern. Better patterns kill better and at longer ranges.
Mark
__________________
Don't hunt with a gun that will embarrass your dog!
USMC Retired
USMC Distinguished Marksman
USMC Distinguished Pistol Shot
NRA Benefactor - Ring of Freedom member
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