12 guage with 2 3/4" will kill a turkey just fine at 33 yds. No kick, nice and easy. That what I have for my wife to use. I'm using the 3" but wouldn't even consider 3 1/2 for turkeys.
You're good to go man! Just pattern that baby and find a bird!
Which choke/load etc. is a tough one. I shoot Hevi #5's with an undertaker. Take my choke off my gun and give you a shell and your gun probably patterns different.
Get what you can afford and determine the range however it may pattern. If it's only 25 then only shoot at birds 25 yds and in. If you don't like that then you may have to spend more $$ to keep trying.
Most expensive turkey you will ever sit down and eat by the time your done