By measurement the .300 GNR is a .401 Herters necked to .308, or .30-30 based .30 Herrett "short" cylinder length. Over a .357 based version the .300 GNR has super thick and strong brass with an ample hefty rim. They last tons of loads and are almost indestructible.
Gary's .357 version is a little bit easier to make by simple FL re-sizing/necking operations. The .300 GNR requires a .30-30 to be run through an extra form die and cut off. Not a big deal but an extra step. I actually enjoy the operation.
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30-357
- Derek, 2018-07-28, 08:54
- you are asking about a cartridge that already exists - Gary Reeder, 2018-07-28, 23:11
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in a revolver the 300 GNR with a 110 grain bullet will do
- Gary Reeder, 2018-07-28, 09:46
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Isn't the new .321 GNR a ".308-.357"?
- WB, 2018-07-28, 16:36
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30-357
- Derek, 2018-07-28, 19:22
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the difference is about 20 years and almost 1000 fps
- Gary Reeder, 2018-07-28, 21:42
- 321 - Derek, 2018-07-29, 05:11
- The capacity of the .300 GNR is a little over 20+ gr. - WB, 2018-07-28, 19:49
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the difference is about 20 years and almost 1000 fps
- Gary Reeder, 2018-07-28, 21:42
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30-357
- Derek, 2018-07-28, 19:22
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Isn't the new .321 GNR a ".308-.357"?
- WB, 2018-07-28, 16:36