I used to win more than my share with an old Iver Johnson 16ga. single shot my grandpa gave me. I used to keep a cup of ice water sitting on the ground somewhere. I would then dip the end of the barrel into it prior to shooting just to tighten it up a little more. "No one else ever figured that one out"
What matters most is, how tight the gun can hold a pattern with the #8 cheap loads they will be using.
Followed by, having a good trigger and knowing where the most dense part of your pattern hits at 20 yards
I did most of my winning before Turkey hunting got so big time.
Now just know, you'll be up against guys that have already done thier homework with loads and chokes.
It's fun however. See what ya can come up with.