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Old June 16, 2013, 07:09 PM   #1
mjes92
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Magnum pistol primers for Std loads?

I'm sure this has been asked before. Due to shortages of std pistol primers I have to ask.

What are the consequences of using Magnum small pistol primers in place of std small pistol primers?

Particularly for
9mm 115 gr powerbond over 5.0 grs universial.
.38 spl 158 gr SWC over 3.0 grs clays.

I'm more concerned about an over pressure situation with fast burning powder like clays. Getting impatient waiting for a better choice of primers.

Thanks
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Old June 16, 2013, 10:14 PM   #2
steve4102
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Both of your loads are Max loads. Drop the charge down and work back up.
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Old June 16, 2013, 10:26 PM   #3
Lost Sheep
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I agree with steve4102.

The word "Magnum" in "Magnum Primers" does not mean the same thing as "Magnum" in ".357 Magnum" or "44 Magnum" or "Magnum of Champagne".

Magnum in primers means a but hotter flame that lasts a bit longer than standard priming compound. It's principal reason for being is to ignite large, densely packed charges of hard-to-ignite powder. It will, when used with easy-to-ignite powders cause a change in the pressure curve (generally increasing it), so you do as with any change in components, re-work your charge workup as if you were starting from scratch.

When working with a recipe that is not identical in every aspect to one yuo have found in a loading manual (that is, tested in a ballistics lab) this applies even more so.

Short answer: Go ahead and use them. Expect higher pressures earlier in the burn time, so reduce your starting loads accordingly.

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Old June 16, 2013, 10:51 PM   #4
SQUAREKNOT
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I will be doing the same thing as I found 5000 S&B small pistol magnum primers.
Does anyone know how cast bullets might be affected with the hotter primers?
Will I get a lot of leading?
TIA
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Old June 17, 2013, 12:30 AM   #5
Lost Sheep
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Doubtful
Quote:
Originally Posted by SQUAREKNOT
I will be doing the same thing as I found 5000 S&B small pistol magnum primers.
Does anyone know how cast bullets might be affected with the hotter primers?
Will I get a lot of leading?
TIA
In my experience, leading is caused by poor fit of the bullet to the bore or by too-high of velocity. There may be other causes, but I have not experienced them.

Primer differences, (also in my opinion) cannot possibly make a sizable difference in leading. Barely marginal at the most.

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Old June 17, 2013, 05:39 AM   #6
WESHOOT2
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may have done it meself once or twice (or zillions)

Normally-but-NOT-always perfectly safe and often fine.

Follow the advice above when nearing or at MAXIMUM loads.
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Old June 17, 2013, 12:46 PM   #7
mjes92
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Thanks guys.

I will start with min. loads and work my way up.
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Old June 17, 2013, 03:32 PM   #8
89blazin
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Mag SPPs w/ Unique are all I use in 9mm. Work it up...seems to get a cleaner burn, and adds a nice little pop.
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