Wasn't aware of roll crimping reducing pressure, so that's intriguing, altho I'd have to add that new equipment to the inventory; don't roll crimp now. The smaller gauge inserts in the 20 ga is another angle I hadn't thot of, altho not sure how hard 28 ga bismuth is to find. Also, wasn't aware of Precision Reloading. AA's are straight walled, altho the base is tapered. Thanks for the ideas.
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