Shotgun Bore Diameters

posted Feb 1, 2011, 6:05 AM by Peter Lucas

Gauge 

Bore diameter
(millimeters)

Bore diameter
(inches)

6

23.3

0.92

10

19.7

0.77

12

18.5

0.73

14

17.6

0.69

16

16.8

0.66

20

15.6

0.615
24
14.7
0.58
28
14.0
0.55
32
13.4
0.526
Comments