250/3000 Ackley Improved
Historical Notes:
The 250/3000 Improved was originated by P.O. Ackley in the late 1940's and,
although one of the best of the Ackley "Improved" line of cartridges,
has never achieved great popularity. This statement is based on the fact that it
offers the greatest percentage velocity increase of any of the Improved line of
wildcats. Increased shoulder angle affects performance chiefly because it
increases case capacity. However, it also improves headspacing and decreases
case stretching. There are no significant internal ballistic effects related to
any particular shoulder design. There are several versions of the 250 Improved,
but the Ackley configuration is the best known. The Savage Model 99 lever action
has recently been offered in 250/3000 caliber, and there are tens of thousands
of these fine rifles in the hands of hunters. Handloading owners of these rifles
should be interested in this excellent improved chambering which improves
extraction, extends case life and increases performance markedly.
General Comments:
The 250/3000 Improved offers performance equal to or better than the 257
Roberts. It will, for example, push the 100 grain bullet at a muzzle
velocity of 3200 fps, as compared to the factory 257 loading of the same bullet
that is listed at 2900 fps. The commercial 250/3000
loading of the 100 grain bullet, incidentally, is rated at 2820 fps.
Source: Cartridges of the World
| 250/3000 Ackley Improved Reloading Data | ||||
|---|---|---|---|---|
| Bullet (grs.) | Powder / (grs.) | MV | ME | Source |
| 87 SP | IMR-4350 / 42.0 | 3310 | 2110 | P.O. Ackley |
| 100 SP | IMR-4350 / 41.0 | 3045 | 2060 | P.O. Ackley |
| 100 SP | IMR-4350 / 42.0 | 3200 | 2275 | P.O. Ackley |
| 120 SP | IMR-4350 / 40.0 | 2650 | 1870 | P.O. Ackley |
| 120 SP | IMR-4350 / 41.0 | 2750 | 2020 | P.O. Ackley |
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