I carried an Ithaca auto mag for years, 60 yard shots are common...
Gas operated guns take a lot of the abuse out of heavy pay loads in 12 and 10ga, you can't shoot a gun well that is going to kick [beeep] out of you.
The Remington 1100 3" and the Beretta 390/391 in 3" take a lot of the smack out of heavy loads...means a lot to me.
yotenaylor, has been down the road and is giving it to you straight. When I shot the 10ga auto's, we had copper plated BB's and Copper plated #4 Buck easily attainable. Lots of folks were killing geese with #4 Buck in those days at ranges you would not believe....rarely if ever do you hear any guys talk of it. When lead was outlawed for ducks, then the shells dryed up also for the 10ga.
The 10ga operates at much lower pressures than the 12ga 3 1/2", thus the shot is less deformed and stays in the pattern longer. A guy that hand loads for the 10ga can get some very special performance out of his shotgun. Buckshot also stacks better in the larger 10ga wad better than the 12ga wad.
Loading long range buckshot with the 12 or 10 is very expensive to get set up in, but the results can be very satisfying.