I have experience with break top revolvers and scaling down the charges within the safe pressure ranges but I have not found much information on flare guns and how much they can take. I know there are 26.5mm sleeves to convert the chamber down to a 12ga, but the implication here is likely that the flare gun be used with 12ga flares.
I do however have 12ga adapters that will take a 45acp cartridge. So I was wondering if this 'sleeve within a sleeve' combination + the strength of the flare gun's break action would be able to stand up to an underpowered 45acp lead round at about 12,500 CUP.
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