slated Posted April 11, 2010 Report Share Posted April 11, 2010 I have a old William, moore and gray hammer gun. it has the original black podwer proof marks, but also these markings 18.8 BNP 65x12 850bar I believe BNP is Birmingham nitro proof 65 mm chamber and 12 bore but what load is equal to 850bar? And any idea what the 18.8 is? thanks in advance for any help Quote Link to comment Share on other sites More sharing options...
Dekers Posted April 11, 2010 Report Share Posted April 11, 2010 I have a old William, moore and gray hammer gun. it has the original black podwer proof marks, but also these markings 18.8 BNP 65x12 850bar I believe BNP is Birmingham nitro proof 65 mm chamber and 12 bore but what load is equal to 850bar? And any idea what the 18.8 is? thanks in advance for any help Not my strong point but a word here should resolve everything! http://www.gunproof.com/ Quote Link to comment Share on other sites More sharing options...
slated Posted April 11, 2010 Author Report Share Posted April 11, 2010 I did have a look there, but could only find examples rather than answers, thanks for the reply nick Quote Link to comment Share on other sites More sharing options...
Tank Posted April 11, 2010 Report Share Posted April 11, 2010 is it likely that the 18.8 is the bore diameter in mm? I think the 850 bar is really only for lead or soft shot, but I'm really not sure about this either. All in all, I haven't got a clue Quote Link to comment Share on other sites More sharing options...
Floating Chamber Posted April 11, 2010 Report Share Posted April 11, 2010 When submitted for Nitro Proof, the BORE is measured in METRIC. 18.8mm is the bore when submitted. In the 'old' days, it would have been stamped in imperial. (i.e. inches) and would be 0.740" English 12 gauge is usually 0.729" (nom) US was 0.719" (nom). Hope this answers the question. Quote Link to comment Share on other sites More sharing options...
slated Posted April 11, 2010 Author Report Share Posted April 11, 2010 many thanks it answers 1 of them, but i would still like to know what load I can use in it as it says 850 bar nick Quote Link to comment Share on other sites More sharing options...
seeker Posted April 11, 2010 Report Share Posted April 11, 2010 (edited) sorry duplicate button push! Edited April 11, 2010 by seeker Quote Link to comment Share on other sites More sharing options...
seeker Posted April 11, 2010 Report Share Posted April 11, 2010 From some notes I have, this looks like a Birmingham Nitro Proof under the CIP rules that were used from 1989 onwards ... 65 mm = Chamber Length 850 Bar = Proof Pressure under CIP Rules.(NOT Service Pressure) If so then look at boxes of 65mm carts with CIP stamp on.. the proof and cartridge pressures are linked under CIP rules. There may be 'crossed swords' or an X with letter in the 'segments'... those at 9 & 3 o'clock will be a year code. Since these are only notes check it in a decent reference book ... or phone the Proof House for your own safety. Quote Link to comment Share on other sites More sharing options...
slated Posted April 11, 2010 Author Report Share Posted April 11, 2010 thank you Quote Link to comment Share on other sites More sharing options...
Floating Chamber Posted April 11, 2010 Report Share Posted April 11, 2010 You can safely use any true 65mm (21/2") cartridges from 21 gram up to 32 gram. These shells will be 650 bar or below. Examples: Lyalvale HV, Pigeon Special, Supreme Game 32gram Always check on shell to see -------------65mm------------- Quote Link to comment Share on other sites More sharing options...
slated Posted April 11, 2010 Author Report Share Posted April 11, 2010 Great, thank you very much to everyone for the replies nick Quote Link to comment Share on other sites More sharing options...
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