OK, I'm a gadget guy. I recently saw this shooting rest by Caldwell called the Lead Sled. Its a shooting rest that has a tray that holds up to 100lbs of lead shot, and the butt fits into a cradle. When the gun is fired, the recoil is absorbed by the rest, pretty cool idea.
I recently picked one up through
http://www.sportsmansguide.com where I get a lot of my shooting stuff.
I worked it out really well over the weeked with 2 days and over 75 12ga slugs, most of which were the high powered stuff, fired, and over 100rds of 44mag rifle. I did fire some of the slugs from field positions, but that lead sled really works. Without it, there's no way my shoulder would have put up with 75 big 12ga slug rounds in 2 days.