oneounceload
Moderator
IF you add weight, I would try to add it in a way that you get the balance point where you want it. If you only add weight to the buttstock, and it changes the balance to the rear, your barrel will feel "whippy" as you swing it. Most folks that shoot driven birds like a gun perfectly balanced on the hinge pin so it moves effortlessly, while clay target shooters seem to prefer a little muzzle heavy gun tends to swing smoother on the follow through. With the 870, taking an empty hull and filling it with lead and placing it behind the mag spring will add about 4oz or so. Add another one in the butt and you've gained a 1/2 pound very easily. If you still need more, add another in each location.
Get the gun fitted, a good recoil reduction system - not necessarily just a pad - and shoot light loads - you should be good to go once the shoulder heals
Good luck
Get the gun fitted, a good recoil reduction system - not necessarily just a pad - and shoot light loads - you should be good to go once the shoulder heals
Good luck