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magnum primers in standard loads? Login/Join 
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I have Winchester SPM primers. Can I use these in place of Winchester SP primers? What do you think. Any worries about increased pressures or anything
 
Posts: 247 | Location: SE Pennsylvania | Registered: August 27, 2001Reply With QuoteReport This Post
I Deal In Lead
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As long as you're not using maximum loads, you'll be fine.

A lot of people I know have been doing this in the last couple of years with no problems whatsoever.

Here's a good video explaining the whole thing.

This message has been edited. Last edited by: Flash-LB,
 
Posts: 9394 | Location: Gilbert Arizona | Registered: March 21, 2013Reply With QuoteReport This Post
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My experience is the same. I use them in place of standard small pistol primers with no ill effects. I do not load any of my shells close to the max pressure, though.

Indeed, the thought just entered my head that you might get better (more uniform) ignition and powder burn in very light loads if you use magnum primers.
 
Posts: 1585 | Location: Virginia, USA | Registered: June 02, 2007Reply With QuoteReport This Post
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Thanks for the advise, guys. I'll give it a try.
 
Posts: 247 | Location: SE Pennsylvania | Registered: August 27, 2001Reply With QuoteReport This Post
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The answer is… who knows and, you and I certainly have no idea what’s really happening.

The owner of a well known “boutique” ammo company told us years ago that pressure can go up, stay the same and he’s even seen it go down with magnum primers. So who knows.


_____________________________________________________
Sliced bread, the greatest thing since the 1911.

 
Posts: 19740 | Location: 18th & Fairfax  | Registered: May 17, 2003Reply With QuoteReport This Post
I Deal In Lead
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quote:
Originally posted by cas:
The answer is… who knows and, you and I certainly have no idea what’s really happening.

The owner of a well known “boutique” ammo company told us years ago that pressure can go up, stay the same and he’s even seen it go down with magnum primers. So who knows.



You didn't watch the Video did you? They measured pressure in the testing.
 
Posts: 9394 | Location: Gilbert Arizona | Registered: March 21, 2013Reply With QuoteReport This Post
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I saw NO difference among six different small primers in 9mm with HP38. Well, the Remington small pistol was a little faster than other brands whether pistol, magnum, or rifle.

Large primers in .45 with Bullseye did make a difference, so when my bullet order comes in and I start loading .45 Small with small pistol magnum, I will chronograph a series.
 
Posts: 3091 | Location: Florence, Alabama, USA | Registered: July 05, 2001Reply With QuoteReport This Post
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quote:
Originally posted by Flash-LB:
quote:
Originally posted by cas:
The answer is… who knows and, you and I certainly have no idea what’s really happening.

The owner of a well known “boutique” ammo company told us years ago that pressure can go up, stay the same and he’s even seen it go down with magnum primers. So who knows.


He tested one thing. And I mentioned a man who's company tests a whole array of loads across many many different calibers.

????

You didn't watch the Video did you? They measured pressure in the testing.
 
Posts: 19740 | Location: 18th & Fairfax  | Registered: May 17, 2003Reply With QuoteReport This Post
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