Table 1: Gauge Vs Bore Diameter of Shotgun Pellets

Gauge/BoreWeight* (pounds)Bore diameter (mm)Bore diameter (inches)
0.25467.342.651
0.5253.452.103
0.751+1/346.71.838
1142.421.669
1.512/3037.051.459
21/233.671.326
31/329.411.158
41/426.721.052
51/524.80.976
61/623.350.919
6.2781/6.278230.906
71/722.180.873
81/821.210.835
91/920.390.803
101/1019.690.775
111/1119.070.751
121/1218.530.729
131/1318.040.71
141/1417.60.693
151/1517.210.677
161/1616.830.663
171/1716.50.65
181/1816.190.637
201/2015.630.615
221/2215.130.596
241/2414.70.579
261/2614.310.564
281/2813.970.55
321/3213.360.526
361/3612.850.506
401/4012.40.488
67.621/67.6210.410.41
* 1 Pound / gauge = weight of lead sphere

Table 2: Bore Diameter Vs Weight of Shotgun Ammunition

Gauge (Bore)Bore diameter (mm)Bore diameter (inches)Weight** (Gram)Weight**(Ounces)Weight**(grains)
AA*101.646225.52219.696,080
A½*76.232626.3992.6440,530
0.25*67.342.6511814.366428,000
0.5*53.452.103907.183214,000
A*50.82778.1927.4512,010
0.75*46.71.838604.821.3369328
1*42.421.669453.59167000
B½*38.11.5328.311.585066
1.5*37.051.459302.3910.6674667
2*33.671.326226.883500
3*29.411.158151.25.3332333
426.721.052113.441750
B*25.4197.273.431501
5*24.80.97690.723.21400
6*23.350.91975.62.6671166
6.278230.90672.262.5491114
7*22.180.87364.82.2861000
821.210.83556.72875
9*20.390.80350.41.778778
1019.690.77545.361.6700
11*19.070.75141.241.454636
1218.530.72937.81.333583
13*18.040.7134.891.231538
1417.60.69332.41.143500
15*17.210.67730.241.067467
1616.830.66328.351438
17*16.50.6526.680.941412
18*16.190.63725.20.889389
2015.630.61522.680.8350
22*15.130.59620.620.728319
2414.70.57918.90.667292
26*14.310.56417.440.615269
2813.970.5516.20.571250
3213.360.52614.170.5219
3612.850.50612.590.444194
4012.40.48811.340.4175
67.6210.410.416.710.237104
* Uncommon ones | **Weight of unalloyed (pure) lead ball

Note: All the asterisk (*) sign shotgun ammunition is rarely used. They are commonly employed in punt guns (extremely large shotgun barrel) and very old weapon systems.

Table 3: Shots Sizes in Diameter and Weight

Shot SizeDiameter (mm)Diameter (inches)Pellets per ouncesPellet per gramWeight per pelletAmerican Names
LG9.10.35860.21072.91000 BUCK
SG8.40.33080.28054.6900 BUCK
SSSG6.80.267150.52629.162 BUCK
AAA5.10.20371.29812.5
US BB4.50.177501.7548.75BB
BB4.010.157702.4566.25
13.80.149903.1574.862
23.60.1411003.5084.37
33.30.1291404.9123.12
43.10.1221705.962.58
52.80.1102207.7191.99
62.60.1022709.4731.62
72.40.09434011.9291.28
7 1/22.30.09040014.0351.09
82.20.08645015.7890.97
92.00.03958020.3500.75

Increasing order as per the number of pellets: LG, SG, Special SG, SSG, AAA, AA (~40), A (50), BB, B

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