Magnum primers for 9mm
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Old 06-16-2014, 01:41 AM   #1
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Default Magnum primers for 9mm

I stopped in my local gun shop on sat to inquire about supplies. No powder but he had a box of primers. When he handed it to me I noticed they were magnum primers (cci 550's). I looked puzzled and he quickly said "these are fine, no problem, don't worry use 'em just like the 500's I promise you will have no problems at all". I bought them. And now am having second thoughts. I'd like some opinions from you experts. Should I use them the same as the 500's? Or not?



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Old 06-16-2014, 02:22 AM   #2
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No, you don't.

Magnum primers have a pinch of powdered aluminum, burn hotter, giving higher pressures.

General rule of thumb is reduce starting load by 10%, but would check w/ manufacturer. Other folks may have advice for you.



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Old 06-16-2014, 02:39 AM   #3
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You will be fine, just start your load work at the "Start" charge and work up. No need to go below Start.

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Old 06-16-2014, 02:52 AM   #4
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I use mag primers for everything. I just use the starting load in the book.

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Old 06-16-2014, 03:03 AM   #5
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I see a 10-15 fps increase in velocity with small pistol magnum. If you are
running a striker fired gun you may or may not have issues with light strikes.

When I was loading for 9mm minor, 9mm major, 40 minor and 40 major for
USPSA competition, I used Winchester SP magnum in everything--but ran
a stock striker spring in my Glocks. No problems.

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Old 06-16-2014, 06:47 PM   #6
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Quote:
Originally Posted by c3shooter View Post
No, you don't.

Magnum primers have a pinch of powdered aluminum, burn hotter, giving higher pressures.

General rule of thumb is reduce starting load by 10%, but would check w/ manufacturer. Other folks may have advice for you.
That's exactly what I did with the magnum primers. Then work your way up very slowly. IIRC I ended up using about 10% less powder that what I had been using.
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Old 06-18-2014, 04:30 PM   #7
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Quote:
Originally Posted by c3shooter View Post
No, you don't.

Magnum primers have a pinch of powdered aluminum, burn hotter, giving higher pressures.

General rule of thumb is reduce starting load by 10%, but would check w/ manufacturer. Other folks may have advice for you.
this.

the issue with magnum primers in very small charge weights is over pressure. there is so much energy coming out of a magnum primer its possible to get detonation instead of a controlled burn.

on the other hand since the charge weight in a 9mm is so small you probably wont notice it if it does.

if your getting flattened primers in a 9mm your pressure is too high.

cratering: where the primer metal is flowing into the firing pin channel



flattened primer. not necessarily sign of over pressurein some cartridges. but in a 9mm it is the primer has flattened and totally filled the primer cup.



none of these are ways to measure pressure. they are merely indicators you need to back off.


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