THE AD Posted September 12, 2014 Report Share Posted September 12, 2014 Could anyone tell me what the numbers 12x76 18.4 var ca 90mpa mean cheers Quote Link to comment Share on other sites More sharing options...
Scully Posted September 12, 2014 Report Share Posted September 12, 2014 (edited) 12 bore. 76mm = 3". Can't help with the rest, sorry, but someone else will. Edited September 12, 2014 by Scully Quote Link to comment Share on other sites More sharing options...
Gordon R Posted September 12, 2014 Report Share Posted September 12, 2014 I think:- 12 gauge 76mm chamber - 3" shells 18.4 - size of the bore Don't know about the rest. Quote Link to comment Share on other sites More sharing options...
Gunman Posted September 12, 2014 Report Share Posted September 12, 2014 18.4 is the bore size at proof , Not sure about the rest but many guns bear marks that only mean something to the maker . What gun is it on? Quote Link to comment Share on other sites More sharing options...
Gordon R Posted September 12, 2014 Report Share Posted September 12, 2014 MPA might be megapascals - a measure of pressure. Although 90 would equate to about 7 tons per square inch. Quote Link to comment Share on other sites More sharing options...
victorismyhero Posted September 12, 2014 Report Share Posted September 12, 2014 90 megapascals is 900 bar.... not unreasonable for a shotgun...? Quote Link to comment Share on other sites More sharing options...
Gordon R Posted September 12, 2014 Report Share Posted September 12, 2014 Most seem to be stamped as 3 1/4tons per square inch or 4 tons per square inch. Quote Link to comment Share on other sites More sharing options...
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