James_w12345 Posted July 17, 2014 Report Share Posted July 17, 2014 I bought a browning at auction over a year ago, and i love it. trouble is, I dont know what model is it, nor what (fixed) chokes it has. Is there a way of finding out from the diameter of the bore at the end? (with vernier calipers for example) is it a fixed value, or proportional to the barrel length? Quote Link to comment Share on other sites More sharing options...
matone Posted July 17, 2014 Report Share Posted July 17, 2014 You need to visit a gunsmith,he will be able to give an approximate idea of it`s choking,only patterning will show it`s true effect though. Hth. Quote Link to comment Share on other sites More sharing options...
panoma1 Posted July 17, 2014 Report Share Posted July 17, 2014 The degree of choke (constriction) can only be worked out by comparing the measured difference between the diameter of the barrels at the muzzle and the the diameter of the bores, unless you have a gauge that will measure both...............take it to a competent gunsmith who does! whilst he is about it ask him to measure the wall thickness of both barrels....and make a note of all the measurements for your records! its all good info! P1 Quote Link to comment Share on other sites More sharing options...
Westward Posted July 17, 2014 Report Share Posted July 17, 2014 A gunmith will measure the bore size first because choke diameter is determined by a constriction amount from the bore size. A quarter choke is a 10 thou constriction, half is 20 thou and so on. You may also find that the barrels are stamped up at the breech end with the choking for each barrel. Regardless of any measurements or markings it's a good idea to pattern test. Quote Link to comment Share on other sites More sharing options...
Gunman Posted July 17, 2014 Report Share Posted July 17, 2014 The fact that some guns have the choke marked on the barrel is no guarantee that that that's what they are . Spanish guns for example have a between marking so it could have .008" difference within the range . Continentals often use .02mm steps . Lets be honest does .002" make any real difference . Measure the bore 4 to 6 inches from the muzzle then the choke , take one from the other and that's the actual choke restriction . I recently bored the chokes on an old gun , because of the differences in bore size both chokes actual diameter was near enough the same but gave 1/4 and 1/2 relative . Quote Link to comment Share on other sites More sharing options...
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