My only experience with bismuth shot and card/fiber wads has been in M/L shotguns. It works fine.
With cartridge guns, you should be able to take a plastic wad load and sub with a .125 nitro card on the powder and enough cushion wads to make a good crimp.
The card/fiber wad does not seal as well as a plastic wad so pressure will be a bit lower than the same load with the plastic wad.
Ive done this with lead shot but not bismuth.

Matt
aka Iowa_303