Thread: 7.7x58 Jap
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Old April 19, 2018, 12:18 PM   #12
RC20
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Join Date: April 10, 2008
Location: Alaska
Posts: 7,014
Well my Hornady books says they are similar in power to the 303 British.

Dimensions are close, the 7.7 has a bit more case capacity as its longer. Same powder change has the same velocity. Common powders work in both. The 303 is listed as a bit faster with the same 174 grain bullet.

The action has nothing to do with it. Its the cartridge performance that does and the
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