minion 29 Posted June 16, 2013 Report Share Posted June 16, 2013 Hi, I bought a new shotgun today. picked it up and feels really god. It is a Spanish double trigger side by side. It says choke 17.5 18.5 on one barrel and 18 18.5 on the other. Any one know what that means in full / half etc terms? Quote Link to post
Dubba 72 Posted June 16, 2013 Report Share Posted June 16, 2013 I'm pretty sure that's metric, is the any star like symbols close to those measurements? Quote Link to post
walshie 2,804 Posted June 17, 2013 Report Share Posted June 17, 2013 The 18.5 is the diameter in mm of the bore, so the 17.5 is choked 1mm and the 18.0 is choked .5mm. IMO 1mm choke is full choke and .5mm is 1/2 choke. Quote Link to post
paulus 26 Posted June 17, 2013 Report Share Posted June 17, 2013 divide by 24.4 25.4 to get the imperial then look up on the chart 12 Gauge 20 Gauge 28 Gauge .410" Bore American English Browning Italian Perazzi Percentage Constriction Constriction Constriction Constriction Designation Designation Codes Codes Codes Pattern .000" -.001" .000" - .001" .000" .000" cyl true cylinder *** C**** 0 40% .002" - .006" .002" - .004" .001" - .004" .001" - .002" skeet impr cylinder **$ S 1 45% .007" -.013" .005" - .011" .005" - .007" .003" - .006" imp cyl quarter **- **** 3 55% .014" -.023" .012" - .019" .008" - .014" .007 - .012" mod half ** *** 4 60% .024" -.031" .020" - .026" .015" - .020" .013" - .017 " imp mod three quarter *- ** 6 65% .032" -.040" .027" - .033" .021" - .027" .018" - .021" full full * * 9 70% .040"+ .034"+ .028"+ .022"+ ex. full 10 75% ffs here http://www.hallowellco.com/choke_chart.htm Quote Link to post
walshie 2,804 Posted June 17, 2013 Report Share Posted June 17, 2013 divide by 24.4 to get the imperial then look up on the chart 12 Gauge 20 Gauge 28 Gauge .410" Bore American English Browning Italian Perazzi Percentage Constriction Constriction Constriction Constriction Designation Designation Codes Codes Codes Pattern .000" -.001" .000" - .001" .000" .000" cyl true cylinder *** C**** 0 40% .002" - .006" .002" - .004" .001" - .004" .001" - .002" skeet impr cylinder **$ S 1 45% .007" -.013" .005" - .011" .005" - .007" .003" - .006" imp cyl quarter **- **** 3 55% .014" -.023" .012" - .019" .008" - .014" .007 - .012" mod half ** *** 4 60% .024" -.031" .020" - .026" .015" - .020" .013" - .017 " imp mod three quarter *- ** 6 65% .032" -.040" .027" - .033" .021" - .027" .018" - .021" full full * * 9 70% .040"+ .034"+ .028"+ .022"+ ex. full 10 75% ffs here http://www.hallowellco.com/choke_chart.htm He means divide by 25.4 Quote Link to post
paulus 26 Posted June 17, 2013 Report Share Posted June 17, 2013 divide by 24.4 to get the imperial then look up on the chart 12 Gauge 20 Gauge 28 Gauge .410" Bore American English Browning Italian Perazzi Percentage Constriction Constriction Constriction Constriction Designation Designation Codes Codes Codes Pattern .000" -.001" .000" - .001" .000" .000" cyl true cylinder *** C**** 0 40% .002" - .006" .002" - .004" .001" - .004" .001" - .002" skeet impr cylinder **$ S 1 45% .007" -.013" .005" - .011" .005" - .007" .003" - .006" imp cyl quarter **- **** 3 55% .014" -.023" .012" - .019" .008" - .014" .007 - .012" mod half ** *** 4 60% .024" -.031" .020" - .026" .015" - .020" .013" - .017 " imp mod three quarter *- ** 6 65% .032" -.040" .027" - .033" .021" - .027" .018" - .021" full full * * 9 70% .040"+ .034"+ .028"+ .022"+ ex. full 10 75% ffs here http://www.hallowellco.com/choke_chart.htm He means divide by 25.4 im having a mare this morning mate Quote Link to post
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