I used a 16 gauge 26" Win M21 'Skeet' for a few decades for rabbits, pheasants and the like. The Sk1 and Sk2 chokes were more than adequate for any upland game. What it was not good for was waterfowl and HeviShot.
Swtiched to a CSMC RBL in 20 gauge for jump shooting ducks.
Had CSMC make me a 16 gauge Fox for most upland with barrels Tuff Coated for non-toxic shot if the need should ever arise.
Have a pair of Rem 332's for geese and ducks with HeviShot.
Never liked steel shot and bismuth is hard to find.
HeviShot outshoots anything, so I switched guns.
Times change. I change.
My hope is that lead will not be outlawed for upland game and for the Club I shoot at, but here in Wisconsin, it it's State land, you must shoot non-toxic shot!
I did shoot geese for a number of years with a Win M21 32" 'DUCK' using Kent #1 Tungsten-matrix 3" shells. Most 'Ducks' are choked F/F, so 50 yd shots were no problem. But HeviShot is better but not in a M21.-Richard