It may be that the ammo they are referring to has bad brass at the rim. I have seen rims blow out (not Armscor but Remington), probably from a hairline crack at the rim. I was running the timer for a friend shooting a S&W 617 at a pin shoot last winter and had powder blow in my face, the rim split. I would guess if you had two of these flaws side by side that they would both go off. The rims are very close to each other in a NAA mini. Also I think if one did spit in a mini it would be like a hot blow torch on the adjacent rim.
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Double action pin shooter
Last edited by ds-10-speed; July 9, 2018 at 10:35 AM.
Reason: Added info
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