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 Using Small Pistol Magnum primers vs standard (i.e. CCI#500) 
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Location: Bothell
Joined: Sat Oct 4, 2014
Posts: 41
Real Name: 2
Hi all,

anyone have direct experience reloading 9mm with Small Pistol Magnum Primers instead of the standard Small Pistol Primers?

My current recipe is as follows: Xtreme 9mm (124gr HP), 5.0gr of W231, Winchester standard Small Pistol Primers.

I screwed up and accidentally purchased a large amount of Small Pistol Magnum Primers-- what I've found in my research has ranged from "it runs a little hotter, but SHOULD BE OK if you dial back the charge" TO "don't screw around with it... not recommended at all."

I can't ship it back to powder valley, so before I go the path of trying to sell it/trade, I was wondering if there's anyone with first-hand experience with this, what the considerations are, and ultimately, if it's ok, or if i'm subjecting myself to unnecessary risk.

Note that i'm not looking for hypotheticals or statements like "it should work", but for folks who have actually tested it.

Thanks in advance!

Thu Dec 19, 2019 1:38 pm
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Location: On your six
Joined: Fri Feb 23, 2018
Posts: 763
I've done it for AR15 9MM. Back off 20% on your powder and slowly work it up

Or swap it for standard primers

Necessity is the plea for every infringement of human freedom. It is the argument of tyrants; it is the creed of slaves. - William Pitt the Younger

Thu Dec 19, 2019 2:37 pm
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Location: Gig Harbor
Joined: Fri Mar 18, 2011
Posts: 1135
Real Name: Nick
I've done it, no issues. As stated above you'll want to work your load up again.

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Thu Dec 19, 2019 4:25 pm
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Location: Union Gap
Joined: Sun Mar 27, 2016
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Real Name: Randall Knapp
I have done it for .38s and 9mm makes no difference.

Thu Dec 19, 2019 5:51 pm
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Location: Renton, WA
Joined: Sun Mar 13, 2011
Posts: 39512
Real Name: Steve
I've used CCI550 (small pistol magnum) primers for 9mm with 115-grain bullets and W231. No issues.

I'd back off the powder charge a bit and do some test loads, but I think you'll be fine.

And P.S., I was in that situation for the very same reason. :bigsmile:


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Leave it cleaner than you found it.

Thu Dec 19, 2019 5:58 pm
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Location: Bothell
Joined: Sat Oct 4, 2014
Posts: 41
Real Name: 2
Hi guys!

Thanks so much for the input-- it's much appreciated :)

Hope you all have a very Merry Christmas!

Thu Dec 19, 2019 6:44 pm
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