-ben- Posted March 17, 2012 Report Share Posted March 17, 2012 hi i have a miroku 500 it has the sybols on the left barrel; .729 BNP (with a crown above it) 12(in a diamond shape ) 2 3/4 3 1/4 Tons per 70m/m IMP 12 NP SP (in a crown shape) on the other barrel; .729 BNP (with a crown above it) 12(in a diamond shape ) 2 3/4 3 1/4 Tons per 70m/m MOD 12 NP SP (in a crown shape) I (in a circle ) could you tell me what some of this means thanks Quote Link to comment Share on other sites More sharing options...
fenboy Posted March 17, 2012 Report Share Posted March 17, 2012 (edited) hi i have a miroku 500 it has the sybols on the left barrel; .729 BNP (with a crown above it) 12(in a diamond shape ) 2 3/4 3 1/4 Tons per 70m/m IMP 12 NP SP (in a crown shape) on the other barrel; .729 BNP (with a crown above it) 12(in a diamond shape ) 2 3/4 3 1/4 Tons per 70m/m MOD 12 NP SP (in a crown shape) I (in a circle ) could you tell me what some of this means thanks I think BNP means its nitro proofed The 3 1/4 is the maximum pressure for the barrel 2 3/4 chamber lenght as is the 70mm The imp and mod are the chokes = improved cylinder and modified ( 1/2 choke) there are far more knowledgeble people than me on here though who will be able to tell you the lot !! Edited March 17, 2012 by fenboy Quote Link to comment Share on other sites More sharing options...
-ben- Posted March 17, 2012 Author Report Share Posted March 17, 2012 cheers what sort of cartriges can i put through it its a side by side miroku 500 made by browning cheers Quote Link to comment Share on other sites More sharing options...
bedwards1966 Posted March 17, 2012 Report Share Posted March 17, 2012 (edited) on the left barrel;.729 Bore diameter measurement in inches BNP (with a crown above it) Birmingham proof mark I THINK 12(in a diamond shape ) 12 bore 2 3/4 Maximum cartridge length 3 1/4 Tons per Proof pressure I think in tons per inch 70m/m Maximum cartridge length IMP Choke - improved something, cylinder? 12 NP Nitro proof? SP (in a crown shape) on the other barrel; .729 BNP (with a crown above it) 12(in a diamond shape ) 2 3/4 3 1/4 Tons per 70m/m MOD Modified (half choke) 12 NP SP (in a crown shape) I (in a circle ) could you tell me what some of this means thanks Maximum cartridge length is 70mm (2 3/4 inches). I could be wrong on the chokes, or they could have been altered, so you can't be sure about them without measuring them or pattern testing them. Edited March 17, 2012 by bedwards1966 Quote Link to comment Share on other sites More sharing options...
-ben- Posted March 17, 2012 Author Report Share Posted March 17, 2012 what sort of weight cartrige can i use and can steel be used in them cheers Quote Link to comment Share on other sites More sharing options...
-ben- Posted March 17, 2012 Author Report Share Posted March 17, 2012 what sort of weight cartrige can i use and can steel be used in them cheers Quote Link to comment Share on other sites More sharing options...
smig4373 Posted March 17, 2012 Report Share Posted March 17, 2012 Proof Marks Quote Link to comment Share on other sites More sharing options...
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