The smartest thing you can do is buy a Caldwell lead sled for the bench. When I got started into the 3 1/2" 12 gauge turkey load craze, patterning even a few shells was just plain torture. After I bought the "lead sled' shooting all day with any gauge or caliber is no problem. I added 100 lb to the sled, a chunk of steel from a junk yard, and smile now every time I pull the trigger. The lead sled is also ideal to hold and adjust any rifle, even my 22s and air rifle when sighting in a scope that I just mounted. I got over the 3 1/2" 12 gauge and only shoot SxSs now, but the lead sled is here to stay. But, be ready though, as all your friends and family will want to borrow it. You'll thank me after you buy one!
https://www.sportsmansguide.com/prod...well+lead+sled
Bill