I have heard and read on this site that people are succesful with both. Very limited with mod choke distance wise. Plenty a gobbler has been killed to the factory full choke. I have a table somewhere for diameters. 20 ga turkey loads now are better than ever. I would suggest picking up some and do the 10 in circle test at 30 and 40 yds. Count the pellets in the circle and be sure your pattern is straight. I have just had a gunsmith cut a factory modified down and thread for chokes. Its 20in and Dinny sent his at same time and duplicate work and he has field tested his with awesome results. Its worth it. But your factory choke could be wonderful already. Just watch cost because you can wind up investing as much as you could pick up a pump short barrel factory threaded gun for. My case i bought a complete shotgun for 60 bucks to do my work on. So im good.
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Handis 223 Superlight, 357 Maxi x 2,
Pardners 410 22''full, 20ga Tamer, 20ga 20' threaded for chokes youth model, Pardner 12ga 18.5 threaded for chokes.
too many numerous ones that have been sold