Matt gave you some good info above ^^^^.
I would also suggest 1 1/4 oz. 1300 fps and up. For
Lead, I prefer #5 shot.
If you hunt a place that requires non-toxic.
I would suggest 1 1/4 oz steel, 1400 fps and up. #2 or #3 shot.
These shells should cycle any Magnum shotgun. Assuming 12 gauge?