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Author Topic: Has anyone used a magnum primer rather than a standard primer?  (Read 6553 times)

dgray64

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Has anyone used a magnum primer rather than a standard primer?
« on: December 05, 2008, 05:43:56 pm »
I wonder if a magnum primer would affect the performance of a round much.  I have used magnum primers on my black powder revolvers and haven't noticed a difference.  The reason for asking is that often internet suppliers are out of small pistol primers, but they have an abundance of magnum primers (small pistol size).  With money getting more scarce along with gun parts and supplies (at least after Jan 20, 09, I'm looking for short cuts.  Are these dangerous shortcuts?  Thanks for the info.

Dave       ::)

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    xsquidgator

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    Re: Has anyone used a magnum primer rather than a standard primer?
    « Reply #1 on: December 05, 2008, 06:11:09 pm »
    I am about to find out with small rifle primers and will let you know.  My hunch is that it will make a difference.

    With .223 and 55FMJ using BL-C(2) powder, I have not been able to match the factory load velocity even at the max published load of 27.5 grains of BL-C(2).  However, I had ignored the Speer #13 guide recommendation to use magnum SR primers with this powder.  I now have a couple hundred magnum SR primers and am about to work up the same load with them and see. 

    I'm optimistic that it does make a difference.  I just acquired a 30 M1 Carbine and last weekend worked up a load that was very close to the published bullet velocity.  That's the first time that's ever happened to me, every other time my bullets seem to run a little slower than what the books say.

    Soon I will have two data points then to answer your question, one with .223 (55FMJ) and the other with 30 Carbine (110FMJ).

    Dave R

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    Re: Has anyone used a magnum primer rather than a standard primer?
    « Reply #2 on: December 06, 2008, 01:42:40 pm »
    Magnum primers do have more punch that standard primers, so they can increase pressures to unsafe levels. I use magnum primers all the time, but only when the load manual calls for it.  Generally, thats for igniting ball powders or slower burning powders. 

    Some primer maniufacturers don't make magnum primers. I read on the internet (so take it for what its worth) that Speer made magnum primers because they found their standard primers were not strong enough to reliably ignite their ball powders (like H335.)  So, rather that increase the power of their standard primers, they made magnum versions.  Other primer mfgrs, like Winchester, have only one primer that is strong enough to light any powder.

    Changing primers can change the pressure of any load, so always stick with the primers that are recommended, or with loads that you work up.

    coreyacp

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    Re: Has anyone used a magnum primer rather than a standard primer?
    « Reply #3 on: December 06, 2008, 05:09:03 pm »
    I just finished loading 1800 .45 acp rounds with a cast lead 200 Gr SWC on top of 6.8 gr of Unique with some old CCI large Magnum pistol primers that I had lying about for the last 25 years.  Before I had the marathon reloading session, I tested the waters so to speak with 50 rounds and they shot fantastic out of my STI Spartan.  No issues, the brass and primers looked normal afterward.  This 10 round target was shot at 25 yds using the tailgate of my truck and my range bag as a rest.  .
    Utah

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    Re: Has anyone used a magnum primer rather than a standard primer?
    « Reply #4 on: December 06, 2008, 09:19:04 pm »
    Not reccomended, but they can work IF you aren't at the top of the chart and work up the loads carefully.  They can cause erratic velocities with some powders.
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    xsquidgator

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    Re: Has anyone used a magnum primer rather than a standard primer?
    « Reply #5 on: December 19, 2008, 02:34:33 pm »
    Here's a data point with W296 powder: short answer is CCI #450 magnum SR primers don't seem to make any difference when compared to Winchester SR primers (non-magnum ones).

    I don't have my steno pad with me from my range bag, but I shot some 30 Carbine loads last weekend with and without the magnum primers, using 14.5 grains of W296 (half a grain under the max load, previously determined to be my best accuracy load) and 110FMJ bullets.  The two lots of reloads showed almost the same muzzle velocity of about 1940 fps, that is the difference was less than the sd of each lot which was about 20 fps.

    secretbard

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    Re: Has anyone used a magnum primer rather than a standard primer?
    « Reply #6 on: December 22, 2008, 01:57:09 am »
    I interchange them all the time with the rifle brass, but then again, I rarely load to max powder charge... and yes, either way you load them, whether it be rifle or pistol, the magnums will increase pressure approaching max SAAMI.  My recommendation would be to either only use them when your reloading data recommends them, or only use them for slow burning powder.   

    Oohrah

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    Re: Has anyone used a magnum primer rather than a standard primer?
    « Reply #7 on: December 22, 2008, 02:33:26 am »
       I have not noticed a difference except for perhaps a little cleaner
    burn with ball powder.   They are more expensive.  Another one of
    those factors that do not seem to fit is that Wolf small rifle mag primers
    are used by many for semi autos, not because they are hotter, but the
    cup material is harder and possibly thicker.  There is no added primer
    material in this brand of mag primer. 

    xsquidgator

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    Re: Has anyone used a magnum primer rather than a standard primer?
    « Reply #8 on: December 28, 2008, 05:40:59 pm »
    Does it matter or make a difference?  Maybe, depending on the situation.  Here are two data points from my little science experiment I just did with 223 (using BL-C(2) powder) and with 30 Carbine using W296 powder.  Magnum SR primers did make a measureable difference with the 223, but not with 30 Carbine.  This isn't a rigourous experiement because I'm comparing Winchester SR to CCI Magnum SR primers, and I already believe there can be measureable differences between ostensibly the same kind of primers (small rifle, say) made by two different manufacturers.  But, since this experiement was based on seeing a couple packs of CCI Magnum SR primers at the local Gander Mountain when I happened to be in there, that's whatja get.

    223, 55FMJ and 27.5 grains (published max) BL-C(2) in Bushmaster XM15 with 1/9 16" barrel, col 2.215":
    WinSR primers              --> 2815 +- 53 fps (sorry for the high SD, this is just 5 in a row).
    CCI#450 mag SR primers --> 2895 +- 25 fps

    Thus, these CCI magnum SR primers gave the same load about another 80 fps of umph.  I would qualify this observation with the note that I have seen slightly better group sizes when I was using standard CCI SR primers in my 223 loads than with the Winchester SR.  However, I was using CCI standard SR primers back before I had a chronograph, and so I can't say if there really was a difference in muzzle velocity or consistency (sd) with CCI primers vs Winchester.  When I finish using up all the Winchester SR primers I have I will probably restock with CCIs, it's just that they were out of CCIs the last time I made a stock up order.

    30 M1 Carbine, 110 FMJ and 14.5 grains of W296, about 1/2 grain under the published max if I recall correctly
    WinSR primers              --> 1937 +- 6 fps
    CCI#450 mag SR primers --> 1940+- 17 fps

    No significant difference in this cartridge using W296. 

    Smokin

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    Re: Has anyone used a magnum primer rather than a standard primer?
    « Reply #9 on: January 02, 2009, 07:04:24 am »
    Correction.  Speer manual, not Sierra.

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