Small Pistol vs. Small Magnum Pistol Primers

[Flip]

Can you use Small Magnum pistol primers in place of Small Pistol primers for 9mm? This is for paper punching loaded just under 1000 fps. If you already have a recipe, would you rework the recipe or use them as is?


Thanks,
Flip

[Seismic Sam]

Well, I've been reloading 40 years and a bit, and I honestly can't give you an honest answer to your question. Nobody I know has ever been desperate enough to try that, so the answer could be "the load will be hotter" or "the load blew up and now I'm in the ER". With the Smith 500 large Magnum pistol primers and large rifle primers are pretty close to interchanagable, but with a VERY small capacity case like a 9mm you might very well cause a pressure spike and blow up the gun and perhaps yourself.

ONLY way to figure that out would be to start at min load, gradually work up, and see what your chrono says. If the velocity starts to go all over the map for a string, that's a big red danger sign that another tenth or two will detonate.

[Flip]

Thanks for the response Sam,

The person who bought these from JJ's in Crosby was told that they're find for 9mm but you have to load the recipe down a bit. I didn't want to comment to him on this until I had more information but it seems like it wouldn't be too smart to switch a small pistol vs. small pistol magnum primer.


Thanks again,
Flip

[Rodentman]

Back during the last reloading supply crisis, I asked the same question. I DID load some 9mm with SPM primers with no issues. I'm still here, but I am not recommending the practice. I am sure I used a minimum charge, but still that's no guarantee.

With 500 mag I exclusively use LRM primers.

[SIGP240]

For a year or more, Winchester small pistol Primers were marked For both mag and regular. Most 9mm powder choices use fast propellants but small gram weight. The fast powders are retarded and do not detonate. I switched to federal match small primers because that was all Gander had in stock after the school shooting. They work fine in my Colt 6450 and the P-210. However, I lucked into a mountain of WSRs and. Ow the mags go I to the 357 instead

[TTS]

I have never had a problem using Magnum SPP in 9mm, .40 and .357sig, depending on the load I see a 25-50 fps increase and no signs of excessive pressure. I would work the load back up from the start just to be extra safe.

[george]

When I e-mailed federal because I had the sppM's they said the only difference in there's was the mag. has a thicker cup,
CCI claims the Mag. is a little more hotter.
Winchester that I also use the sppM on my 45GAP has worked jest fine but never got a response.
Try the Mfg. I've had reasonable responses to e-mails.

[Xscream]

For a year or more, Winchester small pistol Primers were marked For both mag and regular.

I know this was the case for Large Pistol, how long ago was it that way for small pistol?

[arizona98tj]

I just looked at the Winchester SPP boxes I bought back in May 2008....the are NOT marked as regular and magnum primers. That is the most current box of Winester SPP I have.

[SIGP240]

I may have large and small confused on interchangeability issue . I am down here in Omaha area after successfully buying 25K WSR. I am no xpert, so I do not want to misinform anybody. I do know that the original 357 mags that first came out had small rifle primers on them which, I assume , equated a small pistol mag primer. But hammer guns for the most part do hit the primer pretty hard. I wonder if the pray and spray plastic guns with strikers work on mag primers(?)

[TTS]

I may have large and small confused on interchangeability issue . I am down here in Omaha area after successfully buying 25K WSR. I am no xpert, so I do not want to misinform anybody. I do know that the original 357 mags that first came out had small rifle primers on them which, I assume , equated a small pistol mag primer. But hammer guns for the most part do hit the primer pretty hard. I wonder if the pray and spray plastic guns with strikers work on mag primers(?)

All my plastic guns set off magnum primers without a problem. In fact, I built a 9mm major Glock and used SRM primers with no problems.

[SIGP240]

Great news! I was keeping thd softer primers for the G24C, now I dont have to when I upgrade to the heavy spring.

[TTS]

Great news! I was keeping thd softer primers for the G24C, now I dont have to when I upgrade to the heavy spring.

G24C

[liferefugee]

The brand new winchester spp boxes I have say for standard pistol loads.

Sent from my SCH-I535 using Tapatalk 2

[Rip Van Winkle]

This is what the last Winchester LP primers I used said.