If you can reload lead you might reload bismuth with minimal hassle. Suppose you bought a roll crimper and used this for your bismuth hunting loads, wouldnt have to change the reloader around (the fussy part anyway). Testing a few could corroborate the general assumption that roll crimps may lower pressure and bismuth will raise pressure to arrive at a happy medium. 20 ga no tox that is safe in old guns and with low pressure and velocity is a small market. Boss is also worth investigating.
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