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Thread: Using Magnum Primers

  1. #1
    Boolit Master


    GregLaROCHE's Avatar
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    Using Magnum Primers

    In which cases do people use magnum primers when a normal one is called for? I first tried using them in a 45/70 round that wasnít getting complete powder burn. Didnít help much. I finally went to a faster powder. I bought a box of 1000, so have plenty left to use on something. Do you think they have any advantages with BP? Any other situations to use them in?

  2. #2
    Boolit Buddy
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    I use them and sometimes have to back off powder charge 0.5 grains loading hot loads, which I don't do much anymore. Like you I don't see much difference using them.

  3. #3
    Boolit Buddy
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    Using HS6 you see the difference.

  4. #4
    Boolit Master
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    I use magnum primers simply because you can use magnum with all powders but cannot use regular where magnums are called for. The caveat is that you should back off a bit when substituting magnum for regular while watching for pressure signs.

  5. #5
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    I use them (Mag primers) when the reloading manual specifies it.

    As to going "off book":
    I've read on the interwebs that Mag primers are good to use,
    1. For loads of slow burning and/or hard to ignite powders (typically used in Large Magnum Rifle cartridges).
    2. For loads that will be shot in extreme cold temps.
    3. For Loads where the powder charge takes up very little of the case capacity (ie 38 spl and 45 colt).
    *Now there is much controversy over the third suggestion.
    ~~~~~~~~~~~~~~
    ďIf someone has a gun and is trying to kill you, it would be reasonable to shoot back with your own gun.Ē
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  6. #6
    Boolit Master
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    Use them with BLC2 and Win 748 for more reliable ignition. Tried them with WW 473 in 45 ACP when the regular primers were leaving a bit of unburned powder, didn't seem to make any difference.

  7. #7
    Boolit Grand Master

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    I have used Magnum Pistol Primers in lieu of Standard, but as with any change in components, did another load workup. Of course when using slower powders I normally started with Magnum primers and as experiments tried Standard. Yes, not really a straight across comparison because of doing another load workup, but that's my SOP. IIRC; some loads (powder/bullet combos) were better with Magnum, more consistent, more accurate, but overall not a lot of difference...
    My Anchor is holding fast!

  8. #8
    Boolit Grand Master

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    Seems like the main use ... lately ... is when that's all you have and / or all you can get .

    I was reading a magazine article about using small rifle primers in place of small pistol primers for the same lack of availability problems .

    Necessity makes you do strange things sometimes ... just be careful !
    Gary
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    Proud Member of The Basket of Deplorables

  9. #9
    Boolit Grand Master Texas by God's Avatar
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    I have never used small rifle magnum, small pistol magnum, or large pistol magnum primers and I've been loading since 1972. I've used a lot of large rifle magnum primers for ball powder and general use because I was given near 6000 of them way back when. I have saved them for primer shortages- and those come around as most of you know.

    Sent from my SM-A716U using Tapatalk

  10. #10
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    I use Fed215s in the 470NE, 375 Ruger and 300 Win mag where called for.
    For handguns, I use mag primers with 296.
    John Linebaugh cautioned me against using mag primers in the 500 Linebaugh, he said that it would jump the pressure around 10kpsi.

  11. #11
    Boolit Master hickfu's Avatar
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    I use Magnum primers in Magnum rifles but its good to know that I can use them in standard as well.

  12. #12
    Boolit Master 243winxb's Avatar
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  13. #13
    Boolit Master


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    If I'm shooting in cold weather I'll use a mag primer.

  14. #14
    Boolit Master


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    Quote Originally Posted by 243winxb View Post
    Very interesting link. Thanks

  15. #15
    Boolit Buddy
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    I use Russian (Wolf? Tula? I forget) SRMs for all match 223 loads (regardless of powder) in my SR simply because they're so consistent.
    From what I've heard and seen, no American primer can hold a candle to them...and they are (were) cheap!

  16. #16
    Boolit Buddy
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    WLP for mag or regular. No difference.

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Abbreviations used in Reloading

BP Bronze Point IMR Improved Military Rifle PTD Pointed
BR Bench Rest M Magnum RN Round Nose
BT Boat Tail PL Power-Lokt SP Soft Point
C Compressed Charge PR Primer SPCL Soft Point "Core-Lokt"
HP Hollow Point PSPCL Pointed Soft Point "Core Lokt" C.O.L. Cartridge Overall Length
PSP Pointed Soft Point Spz Spitzer Point SBT Spitzer Boat Tail
LRN Lead Round Nose LWC Lead Wad Cutter LSWC Lead Semi Wad Cutter
GC Gas Check