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Standard or magnum primers
#5441187
11/24/14 11:33 PM
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Joined: Jun 2009
Posts: 1,872
jlsbassman
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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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Re: Standard or magnum primers
[Re: jlsbassman]
#5441195
11/24/14 11:46 PM
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Joined: Oct 2006
Posts: 4,200
dawaba
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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.
"For every complex problem there is an answer that is clear, simple.....and wrong." H. L. Mencken
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Re: Standard or magnum primers
[Re: jlsbassman]
#5441199
11/24/14 11:51 PM
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Joined: Jun 2009
Posts: 1,872
jlsbassman
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Do the magnum primers affect pressure very much?
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Re: Standard or magnum primers
[Re: jlsbassman]
#5441277
11/25/14 12:46 AM
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Joined: Mar 2009
Posts: 4,422
jeffbird
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Do the magnum primers affect pressure very much? Yes, they increase pressure, all other factors being equal.
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Re: Standard or magnum primers
[Re: jlsbassman]
#5441360
11/25/14 01:28 AM
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Joined: Feb 2009
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30378
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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.
NRA Benefactor Life Member - Free men should not be subjected to permits, paperwork and taxation in order to carry a firearm.
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Re: Standard or magnum primers
[Re: jlsbassman]
#5441484
11/25/14 02:15 AM
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Joined: Nov 2007
Posts: 9,516
RiverRider
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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.
"Arguing with you always makes me thirsty." -Augustus McRae
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Re: Standard or magnum primers
[Re: jlsbassman]
#5442194
11/25/14 02:27 PM
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Joined: Jan 2011
Posts: 46,950
Gravytrain
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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!
Upon us all, upon us all, a little rain must fall
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Re: Standard or magnum primers
[Re: jlsbassman]
#5442312
11/25/14 03:22 PM
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Joined: Nov 2007
Posts: 9,516
RiverRider
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Sometimes primer selection can be very effective, sometimes it just won't amount to a hill of beans.
"Arguing with you always makes me thirsty." -Augustus McRae
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Re: Standard or magnum primers
[Re: jeffbird]
#5444314
11/26/14 04:11 PM
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Joined: Sep 2009
Posts: 18,934
ChadTRG42
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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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