last time i checked, you simply bell the case as normal and use a round ball thats been passed through a sizing die to get it to the same diameter as you size your normal lead bullets.
ie if you toss your cast bullet through a .452 sizing die, pass a .454 roundball through it toos. crimping is said to turn into like a normal projectile.
however, it does pay attention to the following
alot of bullets are available online. but if you need a particular bullet and its on a 4 month backorder, and all you can find are bh 12-13 at 200 grains. and you need a 250 grains.....
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