6mm-284
Historical Notes:
It is anybody's guess who might have been first to size Winchester's rebated rim
284 down to 6mm.
The conversion is a good one for those interested in achieving maximum velocity
with this bullet size. This cartridge can be chambered in medium length actions.
General Comments:
The 6mm-284 has practically the same capacity as the 240
Weatherby Magnum and the 6mm-06. If loaded to similar chamber pressures it
will produce similar velocity. Therefore, ballistics are indistinguishable.
However, it has advantages over the Weatherby offering. Cases are easier to come
by and non-belted. The 6mm-284 can also be chambered in medium length actions.
Just like the 6mm-06 and 240
Weatherby, when loaded with 100 grain bullets, the 6mm-284 offers only about
100 fps more velocity than the 6mm
Remington; if loaded to the same peak pressures and fired from equal length
barrels. Likely, with heavier than standard bullets this difference could reach
200 fps. As to whether such an advantage might justify conversion of a 243
Winchester or 6mm
Remington chambered rifle to 6mm-284, consider that this is just about the
same performance difference that is found between the 280
Remington and the 7mm
Remington Magnum!
Source: Cartridges of the World
| 6mm-284 Reloading Data | ||||
|---|---|---|---|---|
| Bullet (grs.) | Powder / (grs.) | MV | ME | Source |
| 70 | IMR-4320 / 45.0 | 3600 | 2015 | Hornady |
| 70 | IMR-4350 / 49.5 | 3600 | 2015 | Hornady |
| 70 | H-4831 / 52.5 | 3600 | 2015 | Hornady |
| 75 | H-4831 / 54.1 | 3600 | 2155 | Hornady |
| 87 | H-4831 / 51.7 | 3400 | 2230 | Hornady |
| 100 | IMR-4350 / 49.0 | 3200 | 2275 | Hornady |
| 100 | H-4831 / 51.4 | 3200 | 2275 | Hornady |
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