bigman Posted June 16, 2012 Report Share Posted June 16, 2012 (edited) Bit of help please lads on my barrels it has 18 5 NP 12/70 850 BAR LP/92 Winchestor proof steel could somebody explain what these mean ,does the 850 bar mean i cant use shells over that presure? i have used some rc40 carts that have max1050Bar on them :unsure: cheers Edited June 16, 2012 by bigman Quote Link to comment Share on other sites More sharing options...
bigman Posted June 16, 2012 Author Report Share Posted June 16, 2012 im guessing the np is nitro proof the 70/12 is chamber and gauge havent a clue about the rest Quote Link to comment Share on other sites More sharing options...
mark35gun Posted June 16, 2012 Report Share Posted June 16, 2012 850 bar is the max mean pressure you shouldn't use cartridges over this pressure Quote Link to comment Share on other sites More sharing options...
mr williamson Posted June 16, 2012 Report Share Posted June 16, 2012 850 is maximum working preasure in bar. So i woudnt use ur rc's in it mate. The NP means nitro proof not sure on the 185. What model is it? Might be able to find out more. Quote Link to comment Share on other sites More sharing options...
bigman Posted June 16, 2012 Author Report Share Posted June 16, 2012 (edited) 850 is maximum working preasure in bar. So i woudnt use ur rc's in it mate. The NP means nitro proof not sure on the 185. What model is it? Might be able to find out more. glad i spotted it now i was told the carts would be fine in the gun by shop owner its a Winchestor 101 xtr pigeon grade also checking again its 18 5 not 185 if it makes any difference Edited June 16, 2012 by bigman Quote Link to comment Share on other sites More sharing options...
mr williamson Posted June 16, 2012 Report Share Posted June 16, 2012 Nice gun dont be blowing it up ha ha. Always wanted 1 of those. Ther quite hard to come bye. 18.5 is what it should say its proof in kg Quote Link to comment Share on other sites More sharing options...
mr williamson Posted June 16, 2012 Report Share Posted June 16, 2012 (edited) 1050bar is a hefty cartridge what shot size and grm are they ? thats magnum teritory i would of thought. Edited June 16, 2012 by mr williamson Quote Link to comment Share on other sites More sharing options...
bigman Posted June 16, 2012 Author Report Share Posted June 16, 2012 (edited) Thanks mate i do keep it clean she is spotless to be fair Think i need a cheap semi for the larger stuff then there 3 shot 40g semi magnum give a good shove in the shoulder Edited June 16, 2012 by bigman Quote Link to comment Share on other sites More sharing options...
mr williamson Posted June 16, 2012 Report Share Posted June 16, 2012 No worries mate. Pity coz ov just sold a mint escort auto cheap. Its always the case ha ha. If you want a good cartridge within ur guns limit then try eley high flyers in 30 grm 5s. I swear by them. There a fast hard hitting cartridge and they kill cleanly as far as your comfortable shooting. I flattened a fox with 1 and it didnt even flinch. I do usualy use 50grm 3s but shows you how good they are. Quote Link to comment Share on other sites More sharing options...
bigman Posted June 16, 2012 Author Report Share Posted June 16, 2012 would i be right in thinking that the proof steel means its proofed for steel shot Quote Link to comment Share on other sites More sharing options...
mr williamson Posted June 16, 2012 Report Share Posted June 16, 2012 I might have a webley 810 semi in 3" coming up for sale in the near future. It imaculate be looking around 250. Il pm you when it does Quote Link to comment Share on other sites More sharing options...
mr williamson Posted June 16, 2012 Report Share Posted June 16, 2012 Yeh ur right buddy. But if you are using steel half choke maximum seen a barel or 2 turn into a blunderbuss ha ha Quote Link to comment Share on other sites More sharing options...
bigman Posted June 16, 2012 Author Report Share Posted June 16, 2012 Yeh ur right buddy. But if you are using steel half choke maximum seen a barel or 2 turn into a blunderbuss ha ha well thats that ruled out then the chokes are fixed at full# an imp mod## Quote Link to comment Share on other sites More sharing options...
aister Posted June 16, 2012 Report Share Posted June 16, 2012 (edited) my browning ultra gti is proofed to 850bar but all of the clay shells i use including the 24gr no9 skeet shells are all 900bar. the only shell i have thats 850 is a light 2 1/2" 30gram no 5, i think it was hull maybe. i thought it was a bit odd that even the 24gram shells were over what the gun was proofed too. not that i am perticularly worried about it but i dont think i will be putting any mini mags through it. Edited June 16, 2012 by aister Quote Link to comment Share on other sites More sharing options...
Al69ec Posted June 16, 2012 Report Share Posted June 16, 2012 The 18.5 is the bore diameter, nothing to do with proof or service pressure Quote Link to comment Share on other sites More sharing options...
wymberley Posted June 16, 2012 Report Share Posted June 16, 2012 (edited) Nice gun dont be blowing it up ha ha. Always wanted 1 of those. Ther quite hard to come bye. 18.5 is what it should say its proof in kg Surely the 18.5 is the barrel ID in mms. If I were you, I'd do some checking. I will not say more because I don't KNOW whether the 850 is service or proof and the same applies to the cartridges. In other words, if the gun is service and the cartridges refer to proof then the shop chappie could well be right. As it's you pulling the trigger, the onus is on you to know. I'd ignore all comments on here regarding the proof marks and seek professional advice. Be sure, be safe. Edit: Al, you weren't there when I started! Edited June 16, 2012 by wymberley Quote Link to comment Share on other sites More sharing options...
mark35gun Posted June 16, 2012 Report Share Posted June 16, 2012 The 18.5 is the bore diameter, nothing to do with proof or service pressure Correct, measured 9" from the breech face Quote Link to comment Share on other sites More sharing options...
wymberley Posted June 16, 2012 Report Share Posted June 16, 2012 Correct, measured 9" from the breech face Wouldn't that be for 0.729" (standard)? I've always wondered how the English 9" dimension was expressed if the bore was given in metric - 23ish mm? Quote Link to comment Share on other sites More sharing options...
mark35gun Posted June 16, 2012 Report Share Posted June 16, 2012 Wouldn't that be for 0.729" (standard)? I've always wondered how the English 9" dimension was expressed if the bore was given in metric - 23ish mm? Proof rules have changed over the years as have the markings, .729 would be the old way of measurement, but wether you use 9" Or 228.6 mm it does not matter as long as its in the same place, I'm not sure if it should now be expressed in mm or not Sizes are now marked In mm interestingly though, if its marked in thous then you are allowed a bore enlargement up to the next bore size which is .741 which gives 11 thou, if metric marks are present then you are allowed .2 enlargement which is 8 thou regardless of the next bore size Quote Link to comment Share on other sites More sharing options...
wymberley Posted June 16, 2012 Report Share Posted June 16, 2012 Proof rules have changed over the years as have the markings, .729 would be the old way of measurement, but wether you use 9" Or 228.6 mm it does not matter as long as its in the same place, I'm not sure if it should now be expressed in mm or not Sizes are now marked In mm interestingly though, if its marked in thous then you are allowed a bore enlargement up to the next bore size which is .741 which gives 11 thou, if metric marks are present then you are allowed .2 enlargement which is 8 thou regardless of the next bore size Exactly, it's a minefield. The problem is is that Joe Bloggs has to understand it in order to be safe. As the changes are legion this becomes increasingly difficult and therefore we must be able to rely on the professionals to ensure that we don't come to grief. Quote Link to comment Share on other sites More sharing options...
mr williamson Posted June 16, 2012 Report Share Posted June 16, 2012 If the above is true why does it say 18.5 kg. I thought kg was used to measure weight and also presure? Quote Link to comment Share on other sites More sharing options...
Al69ec Posted June 16, 2012 Report Share Posted June 16, 2012 I think you must be miss reading it. 18.5 will be stamped on both barrels . It's the bore diameter, I very sure it won't be stamped 18.5 kg. that equated to neither barrel weight or service pressure. It may be barrel weight on a military canon! :-) :-) Quote Link to comment Share on other sites More sharing options...
bigman Posted June 16, 2012 Author Report Share Posted June 16, 2012 I think you must be miss reading it. 18.5 will be stamped on both barrels . It's the bore diameter, I very sure it won't be stamped 18.5 kg. that equated to neither barrel weight or service pressure. It may be barrel weight on a military canon! :-) :-) there is no kg just 18 5 on both barrels ,thanks for all replys guys hopefully ill get to the bottom of it some how Quote Link to comment Share on other sites More sharing options...
mr williamson Posted June 16, 2012 Report Share Posted June 16, 2012 Maybe. Getting mixed up. Sorry guys Quote Link to comment Share on other sites More sharing options...
Hector Vector Posted June 17, 2012 Report Share Posted June 17, 2012 18 5 (18.5 perhaps?) is the bore diameter in mm at the time of proof, NP indicates that it is for use with nitro cartridges, 12/70 indicates it's chambered for 70mm 12 bore cartridges, 850 Bar is your maximum service pressure (do NOT use cartridges exceeding this figure) and LP/92 tells you it was proofed (or maybe re-proofed) at the London Proof House in 1992. Quote Link to comment Share on other sites More sharing options...
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