conversion chart

[doc623]

Am looking for conversion chart/table.
For example 12GA = ____ cal.
or .50 cal = ____ GA.
Any help?

 

[GrayBear]

Bore (gauge)____Caliber

1______________1.669
2______________1.325
3______________1.157
4______________1.052
5______________.955
6______________.919
7______________.873
8______________.835
9______________.803
10_____________.775
11_____________.751
12_____________.729
13_____________.710
14_____________.693
15_____________.677
16_____________.662
17_____________.649
18_____________.637
19_____________.629
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
33_____________.520
34_____________.515
35_____________.510
36_____________.506
37_____________.501
38_____________.497
39_____________.492
40_____________.488
41_____________.484
42_____________.480
43_____________.476
44_____________.473
45_____________.469
46_____________.466
47_____________.463
48_____________.459
49_____________.456
50_____________.453
51_____________.450
52_____________.447
53_____________.444
54_____________.442
55_____________.439
56_____________.436
57_____________.434
58_____________.431
59_____________.429
60_____________.426
61_____________.424
62_____________.422
63_____________.419
64_____________.417
65_____________.415
66_____________.413
67_____________.411
68_____________.409
69_____________.407
70_____________.405
71_____________.403
72_____________.401
73_____________.399
74_____________.398
75_____________.396
76_____________.394
77_____________.392
78_____________.391
79_____________.389
80_____________.387
81_____________.386
82_____________.384
83_____________.383
84_____________.381
85_____________.379
86_____________.378
87_____________.377
88_____________.375
89_____________.374
90_____________.372
91_____________.371
92_____________.370
93_____________.368
94_____________.367
95_____________.366
96_____________.364
97_____________.363
98_____________.362
99_____________.361
100____________.360
101____________.358
102____________.357
103____________.356
104____________.355
105____________.354
106____________.353
107____________.352
108____________.350
109____________.349
110____________.348
111____________.347
112____________.346
113____________.345
114____________.344
115____________.343
116____________.342
117____________.341
118____________.340
119____________.339
120____________.338
121____________.337
122____________.3365
123____________.336
124____________.335
125____________.334
126____________.333
127____________.332
128____________.331
129____________.330
130____________.3295
131____________.329
132____________.328
133____________.327
134____________.3265
135____________.326
136____________.325
137____________.324
138____________.323
139____________.322
140____________.3215
141____________.321
142____________.320
143____________.319
144____________.3185
145____________.318
146____________.317
147____________.316
148____________.3155
149____________.315
150____________.314

This information was obtained from Martin Pegler's
book "Powder and Ball Small Arms".

GrayBear

 

[doc623]

Thank you.

 

That chart also applies to the numbers that are found on old bag molds also, and is a good resource when reading old accounts of rifle bore, as before about 1840 everything was pretty listed as bore or guage, and not caliber. Bill