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Nobody really knows the answer to that. There was a letter floating around a while back that Pedersoli supposedly sent to those who asked about their BP cartridge rifles. They said that the rifles were tested with a charge 30% greater than normal. But as far as a C&B revolver, it's pretty much a mystery, at least to the best of my knowledge.
We know that you can put as much powder in an 1858 as it will hold and nothing untoward will happen. And based on R&D and Kirst's testing, we know that "cowboy" loads will be just fine in a steel framed revolver. And, as far as I know, that's the sum of the public knowledge of what a C&B revolver will do.
Incidentally, whatever testing the Italians do would be based on the European standard (I forget what it's called) and wouldn't really translate into a SAMMI-compatible value. Again, that's just my understanding - I've never found anything like a conversion table between any of the proofing standards.
Cutting a channel in the recoil shield will not affect the strength of the revolver - it's a non stress bearing part of the frame.
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Well we don't rent pigs and I figure it's better to say it right out front because a man that does like to rent pigs is... he's hard to stop - Gus McCrae
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