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The revised list revised yet again; there are now 39 calibers:
5.6x57 RWS
.220 Swift (By G&H on a 1900 Action)
.243 Win, .244 Rem
.256 Gibbs Magnum
.257 Rob, .257 Wby
.264 Win
6.5x54 MS (aka 6.5x53, .256 MS), 6.5x55, 6.5x57, 6.5x68S
6.8x57 Chinese
.270 Win
.280 Rem
7x57, 7x64
.308 Win
.30-06 (aka 7.62x63)
7.65x54 Arg
7.7 x 64 ????
8x56 MS, 8x57JS, 8x60, 8x64S, 8x68S
9x56 MS
.338 Win
.358 Win
9.3x53 (Swiss, John Walter, Rifles of the World)
9.3x57 (Rumored)
9.3x62
9.5x56 MS (aka 9.5x57)
.375/43/270 Westley Richards Proprietary Cartridge
10.75x57
10.75x63 (Model 1912, John Walter, Rifles of the World)
10.75x68
.400/.375 H&H
.458 Win

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How about the .318 WR?

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Edited to add the .375/43/270 Westley Richards.

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Added .220 Swift and updated count to 37

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Edited to add .256 MS

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