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Max Online: 16728 @ 03/25/12 08:51 AM
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#5441187 - 11/24/14 05:33 PM Standard or magnum primers
jlsbassman Online   content


Registered: 06/18/09
Posts: 483
Loc: Royse City
I was reading one of the reloading manuals for 243 and it says for H414 and 760 they recommend using magnum primers. Is this your experience or does this matter?

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#5441195 - 11/24/14 05:46 PM Re: Standard or magnum primers [Re: jlsbassman]
dawaba Offline
Extreme Tracker

Registered: 10/22/06
Posts: 4200
Loc: Big Eddy Road, Noonday
I use magnum primers behind ball powders like WW760 and H450 in most cartridges, as a matter of habit. Just yesterday, I was loading up some .243 cases with these two powders; I employed Federal LR Mag primers.

One of my favorite loads in the .22-250 features WW760. I've found that standard primers give better consistency over Magnum primers here. But in more capacious cases, I routinely use magnum primers, but only because all the experts and manuals recommend them.

Apparently ball powders are a little difficult to ignite, thus the recommendation of higher brisance primers.
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"For every complex problem there is an answer that is clear, simple.....and wrong." H. L. Mencken

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#5441199 - 11/24/14 05:51 PM Re: Standard or magnum primers [Re: jlsbassman]
jlsbassman Online   content


Registered: 06/18/09
Posts: 483
Loc: Royse City
Do the magnum primers affect pressure very much?

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#5441277 - 11/24/14 06:46 PM Re: Standard or magnum primers [Re: jlsbassman]
jeffbird Online   content


Registered: 03/09/09
Posts: 2370
Originally Posted By: jlsbassman
Do the magnum primers affect pressure very much?


Yes, they increase pressure, all other factors being equal.

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#5441360 - 11/24/14 07:28 PM Re: Standard or magnum primers [Re: jlsbassman]
30378 Offline


Registered: 02/14/09
Posts: 2849
Loc: Deer Park, Tx.
I use IMR-4350 as where the std primers stop and mag primers start. For powders including IMR-4350 and faster I use std primers. All powders slower than IMR-4350 I use mag primers.
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#5441484 - 11/24/14 08:15 PM Re: Standard or magnum primers [Re: jlsbassman]
RiverRider Online   content
THF Trophy Hunter

Registered: 11/11/07
Posts: 7258
Loc: Wise Co.
Per Accurate Arms website FAQs:

17. Do Magnum Primers cause higher pressures than standard primers?

Not always, and unfortunately it’s hard to predict and quantify. It depends on the combination of powder-caliber-pressure/performance level. However, in most cases the difference is small especially in the case of rifle calibers. In the case of handgun caliber certain magnum primers can cause higher pressures, however this is more the exception than the rule. Also the number of handgun calibers that really requires a magnum primer is limited to large capacity calibers using relatively slow burning powders.

There are also sometimes big differences between makes of primers which complicates the issue even further.
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#5442194 - 11/25/14 08:27 AM Re: Standard or magnum primers [Re: jlsbassman]
Gravytrain Online   content
THF Celebrity

Registered: 01/06/11
Posts: 22748
Loc: Rowlett, Tx
The accuracy aficionados like to tweak that kind of stuff. On non-magnum calibers I use non-magnum
standard CCI primers period. I forget what caliber it is was, maybe 260 or Creedmoor, but the accuracy
nuts had the manufacturer take what normally would be a large rifle pocket and go down to a small rifle pocket
then they use a small rifle magnum primer... I'm sure it's accurate but dang!

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#5442312 - 11/25/14 09:22 AM Re: Standard or magnum primers [Re: jlsbassman]
RiverRider Online   content
THF Trophy Hunter

Registered: 11/11/07
Posts: 7258
Loc: Wise Co.
Sometimes primer selection can be very effective, sometimes it just won't amount to a hill of beans.
_________________________


Originally Posted By: Ronald Reagan
It's not that liberals are not smart, it's just that so much of what they know isn't so.

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#5444314 - 11/26/14 10:11 AM Re: Standard or magnum primers [Re: jeffbird]
ChadTRG42 Online   happy
THF Celebrity

Registered: 09/16/09
Posts: 11492
Loc: Lewisville, TX
Originally Posted By: jeffbird
Originally Posted By: jlsbassman
Do the magnum primers affect pressure very much?


Yes, they increase pressure, all other factors being equal.

Yes. My findings is a mag primer will increase speeds/pressures equal to about .3 to .6 grains of powder. It depends on the type of powder used, and the amount of powder being used how much it will effect the pressures. In a 243 Win case, a standard or mag will be fine for any powder used.
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