Not find the stuff, you would have to make it. As far as I know, nobody makes a 50-30 sabot. The closest thing is maybe one meant for a 50 cal muzzleloader, and I think that would only step down to a 45 or 44. You would also be on your own as far as data went since nobody has tried that.
Just a guess on my part, but you might have to invest in a good pair of sunglasses because of the muzzle flash from that combo.
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