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Old August 6, 2008, 04:19 PM   #6
Harry Bonar
Senior Member
Join Date: December 5, 2004
Location: In the Vincent, Ohio general area.
Posts: 1,804
cylinder throats

On that 25 one would almost think it would be old, but no it is probably a .452 groove dia bbl.
You should slug your barrel - if it's .454 your O.K.
We like the cylinder exit to be at groove bbl dia or .001 above. Slug your bbl. and see.
I assume you're shooting cast bullets so as was mentioned you might try that - most moulds throw bullets several thousandths larger than the marked size on your mould.
It all hinges on your barrel groove diameter - if it's .454 or more you're AOK.
If not I'd call S&W and see what they say.
Harry B.
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