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fiatcrew:
I know its well-covered in the book recommended above, but please do the math on back-thrust to satisfy yourself that the conversion is safe.

ie 3 1/2 tons for a shotshell, multiplied by the cross-sectional area (sq in) of the 12-bore case-head, compared with 10 tons or thereabouts for a "light nitro" multiplied by the cross-sectional area of the proposed rifle case-head in sq in.

If considering a full nitro conversion, the new pressure may be 18 or 19 tons (or more!).

Not meaning to be alarmist, but I did feel compelled to add that caution.

These conversions can be marvelous things, but your face is only inches away at the point of discharge, so please err on the side of caution!

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