milo2005 Posted September 22, 2009 Report Share Posted September 22, 2009 (edited) is there anyway you can find out the choke size of your barrel with out a choke gauge ?? i have a baikal o/u thanks Edited September 22, 2009 by milo2005 Quote Link to comment Share on other sites More sharing options...
wymberley Posted September 22, 2009 Report Share Posted September 22, 2009 Milo, hi, Got a feeling this one is going to be fun. You cannot accurately measure choke unless you know the main barrel diameter. However, if you assume (always dangerous) that the gun has not been got at then you can use the nominal barrel dia. For a 12 bore this is 0.729". Using a vernier caliper to measure the muzzle dia. will give a ball park answer. Having said that, no matter what degree of sophisticated measuring equipment you use all you will get is a dimension which may well have no bearing on how the gun shoots. The be all and end all is to pattern it. Cheers Quote Link to comment Share on other sites More sharing options...
milo2005 Posted September 22, 2009 Author Report Share Posted September 22, 2009 so am better off using a gauge ? Quote Link to comment Share on other sites More sharing options...
MC Posted September 22, 2009 Report Share Posted September 22, 2009 No not at all, A gauge will only work if it designed to suit your barrels bore. Baikals always used to be .729" bore when I worked on them so you should be able to deduce what choke is in each barrel by using a vernier. The bore diameter should be stamped on the proof marks. Assuming your bore is .729" then cylinder would be .729" at the muzzle 1/4 would be .719" 1/2 would be .709" 3/4 would be .699" full would be .689" If the barrel is full length and has not been shortened it should have a criss cross pattern on the muzzle. Quote Link to comment Share on other sites More sharing options...
wymberley Posted September 22, 2009 Report Share Posted September 22, 2009 Yes, because it's easier, but it'll still be ball park. Cheers Quote Link to comment Share on other sites More sharing options...
milo2005 Posted September 22, 2009 Author Report Share Posted September 22, 2009 the barrels are stamped 18.3, if this help as you can see Quote Link to comment Share on other sites More sharing options...
MC Posted September 22, 2009 Report Share Posted September 22, 2009 The stamps along side that are the manufactured sizes, you had half in the bottome barrel and full in the top which is how all baikals came in to the country. The were there altered by cutting a certain ammount off the barrel. It was a long time ago when I used to do it but I think that 27 5/8" from the breech gave 1/4 and 1/2 and 27 3/8 gave cyl and 1/4. 18.3 is the bore in millimeters which equates to .720" so if you take .009 off the measurements that will give you a rough guide. Quote Link to comment Share on other sites More sharing options...
wymberley Posted September 22, 2009 Report Share Posted September 22, 2009 Hi, again, Getting confused? MC's figures are good. I think you are talking about a choke gauge. The datum for these is the nominal bore diameter. So, if you're measuring a 12 bore with a 12 bore gauge all will be well provided your barrel is that nominal diamension. However my remarks about patterning are good. Good luck. Quote Link to comment Share on other sites More sharing options...
milo2005 Posted September 22, 2009 Author Report Share Posted September 22, 2009 (edited) 1/2 bottom and full top does ring a bell , as i have just got the gun, and i think that's what the lad said who i got it off i dont think the barrels have been cut , but not sure there are 27,1/2" Edited September 22, 2009 by milo2005 Quote Link to comment Share on other sites More sharing options...
wymberley Posted September 22, 2009 Report Share Posted September 22, 2009 hi, You and MC posted while I was typing. There we go cracked it! If you can get access to a vernier you will get a more accurate answer but the gauge will do. However, with the gauge you will have take the next lowest choke level to what the gauge tells you: eg gauge 3/4 your barrel is 1/2. It works because full, 3/4, 1/2 and 1/4 chokes are all 0.010" in difference and you need to deduct, as MC says, 0.009". What's a thou among friends! Cheers Quote Link to comment Share on other sites More sharing options...
wymberley Posted September 22, 2009 Report Share Posted September 22, 2009 hi, You and MC posted while I was typing. There we go cracked it! If you can get access to a vernier you will get a more accurate answer but the gauge will do. However, with the gauge you will have take the next lowest choke level to what the gauge tells you: eg gauge 3/4 your barrel is 1/2. It works because full, 3/4, 1/2 and 1/4 chokes are all 0.010" in difference and you need to deduct, as MC says, 0.009". What's a thou among friends! Cheers Quote Link to comment Share on other sites More sharing options...
MC Posted September 22, 2009 Report Share Posted September 22, 2009 The only reason I said .009 is because his barrel is 18.3mm which is .720 not .729. I am not an engineer working to the nearest thou, I am a joiner and we like to be exact If your barrel is 27 1/2" then chances are it has been cut down as I am certain they were 28 1/2" from the factory. Quote Link to comment Share on other sites More sharing options...
wymberley Posted September 22, 2009 Report Share Posted September 22, 2009 MC, Hi, Do you want to come and fit my kitchen? Cheers Quote Link to comment Share on other sites More sharing options...
milo2005 Posted September 22, 2009 Author Report Share Posted September 22, 2009 MC, Hi,Do you want to come and fit my kitchen? Cheers fit your own kitchen! thanks for your help lads atb mark Quote Link to comment Share on other sites More sharing options...
mr salt Posted September 22, 2009 Report Share Posted September 22, 2009 numbers are fine ,but you just need to pattern test it,with the ammo you like, and normally use. That will show you what its doing. Having an idea of whats comming out the end ,will help.(pattern/spread) cheers scott Quote Link to comment Share on other sites More sharing options...
MC Posted September 22, 2009 Report Share Posted September 22, 2009 MC, Hi,Do you want to come and fit my kitchen? Cheers Of course, Where abouts are you? Quote Link to comment Share on other sites More sharing options...
milo2005 Posted September 22, 2009 Author Report Share Posted September 22, 2009 north africa ,lol back too my thread Quote Link to comment Share on other sites More sharing options...
milo2005 Posted September 25, 2009 Author Report Share Posted September 25, 2009 the barrels are stamped 18.3, if this help as you can see i have been told the the f&m on the side means it is full and 1/2 choked Quote Link to comment Share on other sites More sharing options...
MC Posted September 25, 2009 Report Share Posted September 25, 2009 Milo, That is correct as long as your barrels haven't been altered. ALL Baikals came from Russia with 1/2 and full chokes. They were altered in the Sportsmarketing factory in Colchester where I worked for a couple years after leaving school. Quote Link to comment Share on other sites More sharing options...
milo2005 Posted September 26, 2009 Author Report Share Posted September 26, 2009 cheers MC, thanks for all the info i hope this thread helps other people out as-well, cos there is not that much info on the subject Quote Link to comment Share on other sites More sharing options...
Dave66 Posted September 26, 2009 Report Share Posted September 26, 2009 Just purchased a bore meausuring tool from Brownells in the USA, based on a DTI gauge, stem is about 14 inches long. The only way to accurately measure choke (in comparison with standard bore size) is to get measuring. If you were in Lancashire I would measure it for you. I think the Baikal method off chopping down the barrel only works when the choke is tapered. The ones I have measured seem to be parallel after the forcing cones Cheers Dave Quote Link to comment Share on other sites More sharing options...
poorpeet Posted September 27, 2009 Report Share Posted September 27, 2009 You can download the manual for your gun here: http://www.baikalinc.ru/en/company/39.html Hope that helps Pete Quote Link to comment Share on other sites More sharing options...
milo2005 Posted September 27, 2009 Author Report Share Posted September 27, 2009 helps alot thanks , is there anyway of dating the gun aswell ?? Quote Link to comment Share on other sites More sharing options...
milo2005 Posted October 1, 2009 Author Report Share Posted October 1, 2009 UPDATE right i have just used a choke gauge and it says that it is 1/4 top and /12 bottom .... now i am confused BIG TIME!!unless the barrels have been cut Quote Link to comment Share on other sites More sharing options...
wymberley Posted October 1, 2009 Report Share Posted October 1, 2009 Hi, Milo, Oops! Before I comment, I'm sure you meant 1/2 in the bottom. As I said earlier, the be all and end all is to pattern the gun but there's two things you could do before going to that trouble. Pop in to your local dealer and get him to run his barrel DTI through it. This will immediately give you the mean barrel dia. and the choke dia. This will give you your nominal degree of choke. It will also give you your choke profile, ie, tapered or the usual cone/parallel. Also you could do a quick pattern spread test. From 20 yards and from previously fired barrels fire several shots at suitable targets (cardboard or whatever). Ignoring any obvious flyers, measure the spread dia. and take the average for each barrel. TC is32",IC is26" 1/4 is 23" 1/2 is 21" 3/4 is 18" and FULL is 16" Cheers and good luck Quote Link to comment Share on other sites More sharing options...
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