marshy pete Posted April 6, 2014 Report Share Posted April 6, 2014 Im about to buy a 16b sxs from a mate and we are both unsure of what choke it as. Does anyone know the measurements for a 16? Cheers Quote Link to comment Share on other sites More sharing options...
Graham M Posted April 6, 2014 Report Share Posted April 6, 2014 (edited) 1 - 1.669" 2 - 1.325" 3 - 1.157" 4 - 1.052" 5 - .976" 6 - .919" 7 - .873" 8 - .835" 9 - .802" 10 - .775" 11 - .751" 12 - .729" 13 - .700" 14 - .693" 15 - .677" 16 - .662" 17 - .650" 18 - .637" 19 - .626" 20 - .615" 21 - .605" 22 - .596" 23 - .587" 24 - .579" 25 - .571" 26 - .563" 27 - .556" 28 - .550" 29 -. 543" 30 - .537" 31 - .531" 32 - .526" .410 - .410" You will have to measure the bore properly though and then deduct the constriction at the muzzle. So if the bore is a true .662 and the constriction is .652 & .632 then the choke would be 1/4 & 3/4 Edited April 6, 2014 by Graham M Quote Link to comment Share on other sites More sharing options...
FatFreddysCat Posted April 6, 2014 Report Share Posted April 6, 2014 (edited) http://www.parkerguns.org/pages/faq/ChokeSize.htm Edited April 6, 2014 by FatFreddysCat Quote Link to comment Share on other sites More sharing options...
wymberley Posted April 6, 2014 Report Share Posted April 6, 2014 The whole international choke system has gone to pot. In addition to the 0.662" measurement, you could also find it to be 0.667" or 0.673" dependent upon where and when it was made. For example, the table at Post #3 gives the constriction figures for the 0.667" bore. The only real answer is to pattern it - at least that remains as per. Quote Link to comment Share on other sites More sharing options...
casts_by_fly Posted April 6, 2014 Report Share Posted April 6, 2014 check the barrel flats under the base of the forend. it should be stamped in, either as a measurement (often in mm) or as a symbol. google belgian proof marks and take a picture of them with you on your phone. Each barrel should be marked separately with both choke and bore. Alternatively, if it is a newer gun it may even be marked with a choke word (cyl, imp, etc). rick Quote Link to comment Share on other sites More sharing options...
MAB1954 Posted April 6, 2014 Report Share Posted April 6, 2014 If you want to measure the barrel/choke relationship instead of patterning then you need to measure the bore diameter at a point about 6 inches from end of barrel then measure the choke diameter at a point about 1 inch from end of barrel. The bore minus the choke will give you the choke constriction thus 0.662 - 0.622 = 0.040 which would be full choke. Approximate choke constrictions as follows IC = 0.002 - 0.006 Quarter = 0.007 - 0.013 Half = 0.014 - 0.023 Thre quarter = 0.024 - 0.031 Full = 0.031 - 0.040. Taking these measurements requires some engineering experience and I would respectfully suggest you get a gunsmith to do it. Quote Link to comment Share on other sites More sharing options...
marshy pete Posted April 7, 2014 Author Report Share Posted April 7, 2014 Thanks for all the advice lads, excactly what I was looking for, I'll have a little measure but you may be right MAB, may have to visit a gunsmith...., Quote Link to comment Share on other sites More sharing options...
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