Caliber marks

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Please - no questions about your old guns

 

Caliber/Size/denomination

12ga

mm

Inches

Gauge

Bore

18,9

.744

 

 

18,8

.740

12/1

 

18,7

.736

 

 

18,6

.732

 

 

18,52

.729

12

12

18,5

.728

 

 

18,4

.724

 

 

18,3

.720

 

 

18,27

.719

13/1

 

18,2

.716

 

 

18,04

.710

13

 

16ga

mm

Inches

Gauge

Bore

17,3

.681

 

 

17,2

.677

 

 

17,1

.673

 

 

17,0

.669

16/1

 

16,9

.665

 

 

16,82

.662

16

16

16,8

.661

 

 

16,65

.655

17/1

 

16,49

.649

17

 

16,19

.637

18

 

20ga

mm

Inches

Gauge

Bore

16,2

.638

 

 

16,1

.634

 

 

16,0

.630

 

 

15,9

.626

19

 

15,8

.622

 

 

15,7

.618

 

 

15,63

.615

20

20

15,6

.614

 

 

15,37

.605

21

 

15,5

.596

22

 

24ga

mm

Inches

Gauge

Bore

15,2

.599

 

 

15,1

.595

 

 

15,0

.591

 

 

14,9

.587

23

 

14,8

.583

 

 

14,7

.579

24

24

14,51

.571

25

 

14,31

.563

26

 

28ga

mm

Inches

Gauge

Bore

14,3

.563

 

 

14,2

.559

 

 

14,13

.556

27

 

14,1

.555

 

 

13,98

.550

28

28

14,0

.551

 

 

13,9

.547

 

 

13,8

.543

29

 

32ga

mm

Inches

Gauge

Bore

 

.537

30

 

 

.531

31

 

 

.526

32

 

13,2

.520

33

 

13,1

.516

 

 

 

.515

34

 

13,0

.512

 

 

 

.510

35

 

12,9

.508

 

 

 

.506

36

 

12,8

.504

 

 

 

.501

37

 

12,7

.500

 

 

 

.497

38

 

.410

mm

Inches

Gauge

Bore

10,7

.421

 

 

10,6

.417

 

 

10,5

.413

 

 

10,42

.410

.410

.410

10,4

.409

 

 

10,3

.405

 

 

10,2

.401

 

 

 

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Senast uppdaterad: 2012-12-02