A friend here in Charlotte has a tired Belgian .410 SxS BLNE. The original proofs are 410-50 (2"). My 1914 Midland catalog says their .410 guns can be had in the new 2 1/2" length.
Gamebore offers a 2" .410 with 1/4 oz of shot. Carolina Sporting Arms in Charlotte had some on the shelves for a longtime.
I had a Midland .410 proofed .410 3/8 oz shot. Gamebore also had a 3/8 .410 load. I tried it. I think the skeet targets could outrun the shot they were so light.
You could take the standard .410 wad and cut back the excess length then roll crimp the results.
I am interested in a recipe if one pops up.
