Small magnum pistol primers for 9mm minor

[Zmego]

I can't find any small pistol primers locally but I did find some small magnum pistol primers. Can I use these with 9mm minor loads without issue?

[Dr. Phil]

Yep. Unless you're @ max load, all they will do is give you a free 25 or so FPS. If You're near max, back off a couple tenths... I have switched to all SPM since the experiments.

[jlamphere]

Make sure you have a full power firing pin. If you have reduced power springs, you might have some lite strikes and failure to fire issues. Otherwise it will just raise your PF a few points.

[superdude]

Here is something you might want to be aware of:

http://www.brianenos.com/forums/index.php?showtopic=167976

[atbarr]

I started reloading in "08, everyone knows why. The only primers Powder Valley had was SP mag. I the last 4 + years, I've probably loaded >40,000 with the SP mag primers. Never a problem.

YMMV

[Zmego]

Here is something you might want to be aware of:

http://www.brianenos...howtopic=167976

So from what I can tell based on this topic...magnum on major loads is probably OK but maybe stay away from minor loads? Thanks for the feedback

[thompsoncustom]

After reading that it looking like it was more of a brass problem then a problem with using mag primers with a minor load. I would say just run them and inspect a handful of brass around the primer pocket after firing.

[superdude]

After reading that it looking like it was more of a brass problem then a problem with using mag primers with a minor load. I would say just run them and inspect a handful of brass around the primer pocket after firing.

That might be the case. After reading a dozen or so threads on primers and breech face erosion the specific conditions required for erosion are not clear. The potential causes have been claimed to be: 1) magnum pistol primers in low pressure loads. 2) rifle primers in low pressure loads. 3) loose primer pockets. 4) excessive headspace. 5) soft breech metal. Various kinds of evidence have been offered, but some folks strongly believe in their evidence and some have made good arguments to support their evidence and claims. With all the different opinions and evidence it's hard to nail it down.

[GrumpyOne]

Some magnum primers are harder than others. Winchester small pistol magnum primers use the same cup as the small pistol, as well as Federal. CCI uses their small rifle cup with the small pistol magnums, and it is harder.

[superdude]

Some magnum primers are harder than others. Winchester small pistol magnum primers use the same cup as the small pistol, as well as Federal. CCI uses their small rifle cup with the small pistol magnums, and it is harder.

Is this information published somewhere?

[thompsoncustom]

anyone know what pressure range mag primer don't seal at? Would a primer sealer help build pressure quicker in the cup and help with sealing at lower pressures?