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To put it bluntly, boatmonkey82, you're endangering yourself, and anyone standing near you, when you touch off a metallic cartridge round with it's attendent higher pressures in a SB-1 shotgun receiver, period.
Please don't.
The older shotgun receivers may look the same, but they are cast IRON, not heat-treated steel, like the later SB-2/rifle receivers, and were designed for shotshells generating 12,000 psi - not cartridges generating 2x and 3x higher.
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