I picked up a franchi AF3 in 20 ga last year that I'm leaning on this year. However, I have a model 37 Winchester in 16 ga I want to kill one with too.
Sticking with these two killing machines. The top is an Remington 870 youth model 20 gauge shooting number 9 TSS. The bottom is a Browning Maxis 12 gauge shooting 3 1/2 inch number 6 Heavi shot.
Yes, I used to tote a Mossberg 835 for years and killed many turkey with it. I sold it and upgraded to the Browning.
I saw something slick this a.m. Mossberg makes an o/u 28 gauge turkey model with 20" barrels. Comes with 2 extended turkey chokes, Mossy Oak green leaf and a base for a red dot.