JC, I for one find your posts interesting, informative and educational. After all, the majority of what we deal with is, well, metal. Learning the science behind the metallurgy of our hobby is a big part of that.Too brittle, maybe yes, maybe no.
The photos of frame LOOK like it is malleable(hopefully) cast iron. Hopkins & Allen malleable iron frames were commonly used on pepperbox guns. As the frame in a pepperbox is not under stress from the powder explosion that's not too bad, being in a pepperbox. In a revolver the frame does hold the thing together when fired.
Please bear in mind that in the 19th century there was no way to know if that malleable iron was indeed "malleable" It all depended on how accurate was the chemistry of the casting, and was it heat treated right (about 1750F 24 hours)
Your P.I.T.A. metallurgist. Again.
lite gentle loads will never hurt the weapon. remember keep the loads in reason. just enough powder to get the ball down range to the target and punch a hole in the paper target. BTW that is a nice PEPPER BOX.I have fired ~100 round balls in my 1837 Allen & Thurber .32 caliber Pepperbox, albeit with light 15 grain charges... no apparent issues so far!
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