Probably the best thing to do if you come up with a load that in theory should be safe is just spend the $40 or whatever it is and have Precision Reloading test them. Like if you used that bismuth data thats in the 10k psi range ideally if they were rolled crimped and used a fiber wad the pressures theoretically should drop by a noticeable degree but having them tested would give you some concrete data. As well roll crimping depth can raise or lower pressures but no one ever lists what depth they roll crimp to.
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