Unconventional use of magnum powders

[Cerdan]

It occurred to me today that the 10mmAuto case isn't much smaller than the .357Mag case. So I crunched some numbers and indeed, according to my rough calculations (for length, I used the length of the case minus the rim, which doesn't take into account the space taken up by the web), 10mmAuto case capacity is less than 5% smaller than .357Mag case capacity (1.929cc vs. 2.017cc).

So it got me wondering... Why isn't there any data for H110, 2400, W296, v-N110 for the 10mmAuto cartridge? Those powders should theoretically yield some pretty interesting results, especially with heavier bullets.

Any thoughts? Am I foolish for even considering this?

 

[B]

IIRC v-N110 is used in the 10mm Auto, can't confirm as I am away from my data. As for the others I don't see them outperforming 800X. Just my 0.02c.

 

[sunray]

No such thing as a 'magnum powder'. However, there are several 2400 loads on Handloads.org and one 180 grain load on Alliant's site.

 

[Cerdan]

Oh FFS, some people are anal about the silliest things. Fine, "powders advertised as optimal for applications in magnum handgun cartridges". Happy?

Thank you both for the info. I did indeed find some loads using 2400 on Handloads.org and Alliant's site, the velocities aren't anything to write home about.

I still wonder why "magnum powders" produce the best velocities in the .357Mag cartridges and not in a similar application like 10mm...

 

[Al-Sway]

Magnum powders are usually shaped or coated so as to operate best at higher pressue. Even though the .357 and 10 mm case might have the same capacity, it is the bore size that matters in a straight sided case. I suspect that you cannot put enough of a slow powder into the 10 mm case to achieve the operating pressure that you can in a .357 case.

 

[blacksmithden]

Take a 44 magnum case and fill it with 7828 SSC. That's a really slow powder we use in a lot of larger magnum rifle cartridges. I didn't weigh the charges. Basically, just fill it to where the bullet base is going to be. Cap it off with a 240 grain round nose slug and you'll get 4 things. A fair bit of unburnt powder. Very low recoil. Very little noise. 495 feet per second on the chroney. It was kind of neat..just to do it once....just for something different. I think I loaded up 12 rounds, fired them off, and haven't done it since. I don't even think they were going though the chip board target hangers at 50 yards.

 

[bearhunter]

You shouldn't run into any problems with the slower magnum pistol powders in a 10mm barrel versus a 357mag barrel as the 10mm bore is larger and will give the gasses generated more room to expand without increasing pressures. Actually pressures should be reduced slightly as well as velocities. As long as your loads are kept within reason of course.
A general rule of thumb is "the larger the bore, the faster the powder needed."