Gauge Bore Diameter or Calibre
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"
213
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