I picked up a handful of what I suspect are meant to be cardboard 410 shotgun wads today with the idea of loading up some shot-shells in 44 mag cases.

The little cardboard disks just slip perfectly into a 44 mag case and appear to have been punched out of non-corrugated cardboard about 5/32" or maybe 3/16" thick.

I'm thinking of "salvaging" some shot from a few old 20-guage shotgun shells I have lying around.

I'm thinking I'll put a full-thickness wad on top of the powder, then fill the case with shot, and cap it off with a second wad (maybe split to be only 1/2 thickness). I'll keep that second wad in place with a really heavy roll crimp over the top of it to secure it in place - and then maybe seal it with a little wax or silicone.

What I am looking for is feedback on this idea and suggestions on powder - both type and number of grains.

I really don't think there is going to be any reason to be concerned about the fact that there will be basically no empty space in the casing - is there? My logic is that the weight of the shot charge will be so much lighter than pretty much any bullet available in 44 caliber, it shouldn't even be able to build dangerous levels of pressure, should it?

Anybody got any suggestions?