I don't know whether they're still available, but Gamebore used to make a 12ga TM load in 2 1/2" hulls. 1 1/16 oz of either 5's or 6's--not sure if those are Brit or US shot sizes. The box indicates they're OK in guns with either 3 ton or 850 bar proof. I have a small stash of them which I use very judiciously. I don't hunt waterfowl, and I seldom hunt pheasants where nontox is required--so likely a lifetime supply.