Most of the American ammo manufactures have very souped up 12 and 20ga. shotgun loads now if you want to pay more for them.
I'll will be testing a 20ga pump against my 12ga pump come squirrel season and i will post the results.
I would'nt hesitate to use a 20ga turkey hunting either. I just remembered Dove season opens here soon so I'll get to try my new 20ga pump on them if I get to go.
I'll post my results when I can ...A.H
IN GOD WE TRUST