why not ask around among your friends and see if anyone owns a quality 10 ga and 12 ga they use,
and actually put a few targets up at 30- 40,-50,-60 yards ,
stick a few 2" orange sticky target dots to represent a turkeys head
and try a few shots, using each shotgun,from a typical seated position,
all using the same shot size, get a feel for each guns size weight and effective reach
(lets say #4 or #5 in several of the various shot guns/and gauges)
keep in mind an extra 10-15 yards can easily be the difference between success/failure
but you really should get those turkeys in under 35 yards when you can.
and you try hard to not shoot untill the targets well within your comfort range
thats basically , what I did decades ago, and why I prefer my ithaca mag 10.
sure it will cost you the price of a couple boxes of shells,
if the guys with the shotguns don,t kick in a few to use,
but youll deal in facts vs what some guy posting might say.

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