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Shotgun Bore Sizes

Lead Density(aprox.)

11.352 g/cm3

0.400423 oz/cm3

6.56176 oz/in3

0.41011 llb/in3

2.43837 in3/llb

Bore size is defined as the number of lead balls of a given diameter that can be made from onepound of lead.For shotguns, numeric bore sizes above 32 bore (i.e. smaller diameter) are not generally used.

Volume of 1 pound of lead is (about) 2.43837 in3

Volume of a sphere is (4/3)PiR3

Boresize

Volume

(in3)per ball

R3

(inches3)

R(adius)(inches)

BoreDiameter(inches)

1 bore 2.438369 0.582118 0.834969 1.670

2 bore 1.219185 0.291059 0.662715 1.325

3 bore 0.812790 0.194039 0.578935 1.158

4 bore 0.609592 0.145530 0.525998 1.052

5 bore 0.487674 0.116424 0.488293 0.977

6 bore 0.406395 0.097020 0.459501 0.919

7 bore 0.348338 0.083160 0.436487 0.873

8 bore 0.304796 0.072765 0.417485 0.835

9 bore 0.270930 0.064680 0.401411 0.803

10 bore 0.243837 0.058212 0.387558 0.775

11 bore 0.221670 0.052920 0.375439 0.751

12 bore 0.203197 0.048510 0.364706 0.729

13 bore 0.187567 0.044778 0.355104 0.710

14 bore 0.174169 0.041580 0.346440 0.693

15 bore 0.162558 0.038808 0.338563 0.677

16 bore 0.152398 0.036382 0.331358 0.663

17 bore 0.143433 0.034242 0.324729 0.650

fourten shotgun resources http://www.fourten.org.uk/shotgunbores.html

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18 bore 0.135465 0.032340 0.318600 0.637

19 bore 0.128335 0.030638 0.312910 0.626

20 bore 0.121918 0.029106 0.307605 0.615

21 bore 0.116113 0.027720 0.302643 0.605

22 bore 0.110835 0.026460 0.297986 0.596

23 bore 0.106016 0.025309 0.293603 0.587

24 bore 0.101599 0.024255 0.289468 0.579

25 bore 0.097535 0.023285 0.285555 0.571

26 bore 0.093783 0.022389 0.281846 0.564

27 bore 0.090310 0.021560 0.278323 0.557

28 bore 0.087085 0.020790 0.274969 0.550

29 bore 0.084082 0.020073 0.271772 0.543

30 bore 0.081279 0.019404 0.268718 0.537

31 bore 0.078657 0.018778 0.265797 0.532

32 bore 0.076199 0.018191 0.262999 0.526

33 bore 0.073890 0.017640 0.260315 0.521

34 bore 0.071717 0.017121 0.257737 0.515

35 bore 0.069668 0.016632 0.255259 0.510

36 bore 0.067732 0.016170 0.252873 0.506

37 bore 0.065902 0.015733 0.250574 0.501

38 bore 0.064168 0.015319 0.248357 0.497

39 bore 0.062522 0.014926 0.246216 0.492

40 bore 0.060959 0.014553 0.244146 0.488

41 bore 0.059472 0.014198 0.242145 0.484

42 bore 0.058056 0.013860 0.240208 0.480

43 bore 0.056706 0.013538 0.238331 0.477

44 bore 0.055417 0.013230 0.236512 0.473

45 bore 0.054186 0.012936 0.234747 0.469

46 bore 0.053008 0.012655 0.233033 0.466

47 bore 0.051880 0.012385 0.231369 0.463

48 bore 0.050799 0.012127 0.229751 0.459

49 bore 0.049763 0.011880 0.228177 0.456

fourten shotgun resources http://www.fourten.org.uk/shotgunbores.html

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50 bore 0.048767 0.011642 0.226645 0.453

51 bore 0.047811 0.011414 0.225154 0.450

52 bore 0.046892 0.011195 0.223702 0.447

53 bore 0.046007 0.010983 0.222286 0.445

54 bore 0.045155 0.010780 0.220905 0.442

55 bore 0.044334 0.010584 0.219558 0.439

56 bore 0.043542 0.010395 0.218243 0.436

57 bore 0.042778 0.010213 0.216960 0.434

58 bore 0.042041 0.010037 0.215705 0.431

59 bore 0.041328 0.009866 0.214480 0.429

60 bore 0.040639 0.009702 0.213282 0.427

61 bore 0.039973 0.009543 0.212110 0.424

62 bore 0.039329 0.009389 0.210963 0.422

63 bore 0.038704 0.009240 0.209841 0.420

64 bore 0.038100 0.009096 0.208742 0.417

65 bore 0.037513 0.008956 0.207666 0.415

66 bore 0.036945 0.008820 0.206612 0.413

67 bore 0.036394 0.008688 0.205579 0.411

68 bore 0.035858 0.008561 0.204566 0.409

69 bore 0.035339 0.008436 0.203573 0.407

70 bore 0.034834 0.008316 0.202599 0.405

71 bore 0.034343 0.008199 0.201644 0.403

72 bore 0.033866 0.008085 0.200706 0.401

73 bore 0.033402 0.007974 0.199785 0.400

74 bore 0.032951 0.007866 0.198881 0.3978

75 bore 0.032512 0.007762 0.197993 0.3960

76 bore 0.032084 0.007659 0.197121 0.3942

77 bore 0.031667 0.007560 0.196264 0.3925

78 bore 0.031261 0.007463 0.195421 0.3908

79 bore 0.030865 0.007369 0.194593 0.3892

80 bore 0.030480 0.007276 0.193779 0.3876

81 bore 0.030103 0.007187 0.192978 0.3860

fourten shotgun resources http://www.fourten.org.uk/shotgunbores.html

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82 bore 0.029736 0.007099 0.192191 0.3844

83 bore 0.029378 0.007013 0.191416 0.3828

84 bore 0.029028 0.006930 0.190653 0.3813

85 bore 0.028687 0.006848 0.189903 0.3798

86 bore 0.028353 0.006769 0.189164 0.3783

87 bore 0.028027 0.006691 0.188436 0.3769

88 bore 0.027709 0.006615 0.187720 0.3754

89 bore 0.027397 0.006541 0.187014 0.3740

90 bore 0.027093 0.006468 0.186319 0.3726

91 bore 0.026795 0.006397 0.185634 0.3713

92 bore 0.026504 0.006327 0.184959 0.3699

93 bore 0.026219 0.006259 0.184293 0.3686

94 bore 0.025940 0.006193 0.183637 0.3673

95 bore 0.025667 0.006128 0.182991 0.3660

96 bore 0.025400 0.006064 0.182353 0.3647

97 bore 0.025138 0.006001 0.181724 0.3634

98 bore 0.024881 0.005940 0.181104 0.3622

99 bore 0.024630 0.005880 0.180492 0.3610

100 bore 0.024384 0.005821 0.179889 0.3598

Chamber sizes - Gun Trade - 1906

fourten shotgun resources http://www.fourten.org.uk/shotgunbores.html

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