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Old December 27, 2008, 12:17 PM   #4
Unclenick
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Join Date: March 4, 2005
Location: Ohio
Posts: 16,351
Sorry for the confusion. "Too hot" is colloquial shooter's English actually meaning that the pressure is too high. Pressure that is too high can damage the gun.

If you are getting weak loads from 1.8 grains of HP38, it sounds like the powder has something wrong with it? If it has picked up moisture or if it smells of nitric oxide, or if it has a reddish color it may have been damaged by storage in too much heat or humidity. If you got the powder from another shooter and did not buy it new, that person may have put the wrong powder in the container. Winchester 296 and 748 and Hodgdon H110 and Alliant Power Pistol all look very similar to HP38, but are far too slow burning for the small .25 ACP case. The only other possibility that comes to mind is weak neck tension on the bullet, but if you are shooting the shotgun powder OK, that should not be the problem.


P.S.,
Here is the other published data I have:
Other loads:

Code:
.25 ACP
50 grains Round Nose FMJ Bullet
COL 0.9"

Powder        Charge Weight Range
Bullseye       1.0 to 1.3 grains
Unique         1.7 grains
R1             1.0 grains
700X           0.8 to 1.0 grains
Red Dot        0.8 to 1.2 grains
HP38           1.0 to 1.3 grians
231            1.2 to 1.6 grains
The last two are interesting. HP38 and 231 are actually the same powder packaged under different brands. So, why the big difference in the load recommendations? The answer is that it is actually a non-canister grade powder that is packaged for sale to the public, but is not blended to a constant burning rate, as canister grade powders usually are. Non-canister grades are usually used by manufacturers who test the pressure for each lot of powder individually and adjust the loads to compensate. The two different results for HP38 and 231 above indicate the loads were developed with different powder lots. So now I am also wondering if you got an exceptionally slow lot of HP38? That might also explain it, but testing would have to be done against another lot to see?
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Last edited by Unclenick; December 27, 2008 at 12:36 PM.
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