Yup. .45 muzzleloader sabots are typically built to hold .357-.358" bullets.
They don't stay together very well. That's fine in a muzzleloader where they're packed down with a rod one at a time, and not so fine in a semi-auto magazine or revolver cylinder where recoil jars them loose. Slippery plastic doesn't grip copper or even lead very well.
Casting will likely go by the wayside at some point. I'm betting on sintered metal bullets as the cheap(est) replacement. Look to the replacements for steel shot in the shotgunning world if you want to see the future of cheap bullets. Bismuth, tungsten matrix, iron polymer,etc.
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