Using a LR Magnum primer in place of a LR Standard primer

Discussion in 'The Ammo & Reloading Forum' started by dsv424, Jun 3, 2009.

  1. dsv424

    dsv424 New Member

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    I found some primers for Large Rifle, however they are magnum. Can anyone suggest how I would compensate the load to use these primers in place of standard ones?
  2. woolleyworm

    woolleyworm Active Member

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    I would suggest using it as an excuse to buy a Magnum Rifle !! ;) Me personally, I'd try to find the correct primer; however, it can be done with relative safety if loads are backed off by 10-15% and then tested. Yes, you'll have to rework the entire load for this component change. If possible, I would also go with a slower burning powder and avoid anything in the fast burning category. ( not sure what caliber/load you're looking at loading ) There's several threads on this subject already, I'd research some there too. Good Luck and Be Safe !
  3. 312shooter

    312shooter Active Member

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    I recently found myself in a similar situation, I loaded 168gr BTHP in .308 with both magnum and standard LR primers along with a starting load of AA2520 powder. The chrony revealed an average 70 fps faster with the Magnum primers I found no signs of overpressure at starting load. The speer manual shows data for Magnum primers with certain powders in .308 so that helped out quite a bit. Just make certain you use STARTING LOADS first. Don't get crazy with magnum primers until you find data printed somewhere. And did I mention STARTING LOADS! Let us know what caliber you need to load and maybe someone will have data.
    Last edited: Jun 3, 2009
  4. JLA

    JLA Well-Known Member

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    there is nothing wrong with working a standard rifle load up with magnum primers. The key words here are "working up the load" Dont just push in a mag primer and load a max charge... perfectly good hardware is destroyed in such ways. Just start at min charge and work your way up just like you would with any component change. Just for the record, I have used mag primers in such things as the .223 rem, and the .30 carb, and the .45 ACP, and the .45 colt. ALL of which are not magnum cartridges and none of which have published data using magnum primers. In fact, the most accurate load in my .223 for my AR-15 is worked up with a CCI 450 and Reloder 10X. Shoots 3/4" average groups standing from a homemade rest. and not quite hot enough to lock the bolt to the rear on the last shot... In short, it can be done, safely with a focused mind toward safety and following the rulebook a little bit...;)
  5. 312shooter

    312shooter Active Member

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  6. Popgunner

    Popgunner New Member

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    It's written in at least one manual that you can start at the start load, reduce by 5% & work up to substitute mag primers for standard.

    When Speer introduced mag primers in the sixties they were meant for normal & magnum loads used in cold temps. Before that, magnum cartridges right up to the 460 Weatherby magnum were running fine on regular primers. That's all there was.
  7. dsv424

    dsv424 New Member

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    Thx for the info guys. The gun I will be loading for is Saiga .308 Since I started loading I have never gone higher than the mid point anyway. I have been satisfied with the results just staying in the low to mid range.
  8. woolleyworm

    woolleyworm Active Member

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    curious as to what load you're using currently, if you don't mind me asking?
  9. dsv424

    dsv424 New Member

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    I'll check in my data book when I get home. All my recipes are from the reloading books I have: Hornady, Lyman, Lee, Speer, and the Complete loading book for .308. I load for 110g, 130g, 150g, and 165g.
  10. 312shooter

    312shooter Active Member

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    This is data from the speer #14 manual using magnum primers for .308;

    150gr bullet start and max charge:

    AA2520 44 - 48gr
    H335 43 - 47gr
    Win748 46 - 50gr
    H414 47 - 51gr
    BL-C2 40 - 44gr


    168gr bullet start and max charge

    Win748 42 - 46gr
    AA2460 40 - 44gr
    AA2520 40 - 44gr
    H414 45 - 49gr
    Win760 45 - 49gr
    BL-C2 41 - 45gr
  11. JLA

    JLA Well-Known Member

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    those 110s are real screamers huh. I load the 110 gr sierra hp to 3500 fps in my .30-06 for shooting bottles and stray coyotes at my land. They sure will make a mess of a coyote:D
  12. JLA

    JLA Well-Known Member

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    oh yeah, and incidently I do use CCI mag primers in that cartridge as well...
  13. Bruce FLinch

    Bruce FLinch New Member

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    The mid range tends to be the most accurate, IMO.
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