9Mm and small pistol mag primers?

1Longbow said:
found a box of small magnum pistol primers ,that i didn't know i had. Any problem using them in reloading 9mm?
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Nope. I’ve used them with no issues. You won’t get a nuclear explosion from them. I use just above min loads.


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I have done load workups in 9mm with mag primers - just to have the data - in case mag primers were all I could get ahold of.

They yielded slightly higher chrono numbers. But didn't notice much difference.

So yes, they can be used. But start low and work up - just like with any other new loading.

Mag primers are however, superfluous in 9mm. The case volume is so small that there is never a need to use them.
 
There is a propensity in the small powder space cartridges, for primers to generate enough pressure to unseat the bullet out into the throat of the gun before the powder gets fully burning. It is possible for a magnum primer, with the greater gas volume and ignition pressure it therefore generates, to make that unseating either more or less consistently true, depending on bullet pull, powder burn rate, and actual case volume under the bullet. If you have a chronograph, try both types of primers with small and middling and maximum (short of pressure signs) loads. See which primer in each category gives you the lowest standard deviation in velocity. That will be the one you want to use in that load range. Generally, the worst SD occurs when the bullet is partially unseated and part way to the throat of the barrel when the powder burn becomes vigorous, and that's because its exact position tends to vary with the individual bullet pull of each round, a factor that typically has a bell curve shaped distribution.
 
Magnum primers are about the powder used. Using 'em with powders that don't need 'em won't hurt anything though. However, you might get increased pressures. Not enough to matter though and it still won't hurt anything.
"...primers to generate enough pressure to unseat the bullet..." Any primer will do that in any cartridge.
 
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