FYI, this was made up on the spot at the range, totally improvised.
Take some socks or something like that (I used a woolen beanie) and fold them up and place them inside one of those 25-count packs of 12g shells like you can buy at Wally's World. Wrap duct tape around the box so it can't come open at all. Crush the middle of the big side of the box so it's kind of folded like a hotdog bun and place the fold around the buttplate of your shotgun. Attach with duct tape; starting on the middle back of the "pad," one piece up over the comb, one down under the heel, and one down each side, then wrap a piece around the stock to hold all those on. And no, the duct tape seems to not damage the wood at all after removal. Works like a miracle, so well in fact that I can comfortably fire both barrels of my SxS simultaneously. I also feel SO ghetto right now...
Take some socks or something like that (I used a woolen beanie) and fold them up and place them inside one of those 25-count packs of 12g shells like you can buy at Wally's World. Wrap duct tape around the box so it can't come open at all. Crush the middle of the big side of the box so it's kind of folded like a hotdog bun and place the fold around the buttplate of your shotgun. Attach with duct tape; starting on the middle back of the "pad," one piece up over the comb, one down under the heel, and one down each side, then wrap a piece around the stock to hold all those on. And no, the duct tape seems to not damage the wood at all after removal. Works like a miracle, so well in fact that I can comfortably fire both barrels of my SxS simultaneously. I also feel SO ghetto right now...