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Thanks, but assuming the rifle and design are not strong enough for nitro, will a new set of barrels alone make it strong enough? (Of course I realize the cost of new barrels will easily be $15k plus). Is the depth of the rifling significant pressure wise? I know the weight is important and nitro barrels are significantly heavier.

I'm struggling to get at the fundamental question, because I don't know what it is.

The rifle I am thinking of is something like one of the Fraser hammerless doubles from around 1880.

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I don't think that anyone would try to "upgrade" an 1880 double rifle to a nitro caliber. Basically your frame is iron, nothing like modern steel. In 1880 nitrocellulose wasn't even on the radar screen.

You haven't told us the original caliber and the nitro caliber you are considering.

Curl

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