6mm/30-30 Improved
Historical Notes:
There are actually two versions of the 6mm/30-30, one based on the 30-30
Winchester case necked down without any other change, and the other using
the Improved configuration. The Improved version was the most popular and the
one recommended. The 6mm/30-30 has the same dimensions as the 22/30-30
except for a larger .243 inch neck diameter. The cartridge dates back to the
1940's or earlier, and the version referred to here is the Ackley Improved,
although there may be others. One of the original purposes of the 6mm/30-30 was
for use in rebored and rechambered 22 Hi-Power Model 99 Savage lever actions. It
has also been used in single shot actions. Cases can be formed from 30-30
Winchester or 32 Special brass and might require a set of forming dies plus
a final fire forming. There are more recent versions that use a shortened case
for use in single shot pistols.
General Comments:
The 6mm/30-30, when used in a strong action, can be loaded to almost equal the 243
Winchester. However, when chambered in the Model 94 Winchester class rifles,
it must be loaded down so it does not exceed the working pressure of that
action. It is a good varmint through deer cartridge, but its usefulness at the
present time is primarily as a chambering for single shot actions. Pointed
bullets should not be used in any tubular magazine.
Source: Cartridges of the World
| 6mm/30-30 Improved Reloading Data | ||||
|---|---|---|---|---|
| Bullet (grs.) | Powder / (grs.) | MV | ME | Source |
| 75 HP | IMR-3031 / 37.0 | 3450 | 1980 | P.O. Ackley |
| 75 HP | IMR-4895 / 36.0 | 3265 | 1770 | P.O. Ackley |
| 85 HP | IMR-4895 / 37.0 | 3300 | 2060 | P.O. Ackley |
| 90 SP | IMR-4320 / 38.0 | 3065 | 1880 | P.O. Ackley |
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