Standard or Magnum Primers

Discussion in 'Rifles, Bullets, Barrels & Ballistics' started by JDY, May 8, 2008.

  1. JDY

    JDY Well-Known Member

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    Shooting a 7mmRM 26'' barrel with 168 berger bullets, H1000 powder. Do I need magnum primers?
    THANKS
    JDY
     
  2. johnnyk

    johnnyk Well-Known Member

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    JDY,
    I would try both. I have used magnum primers when others said I didn't need to, which resulted in tighter groups. This was in non-magnum cartridges, .22-250, .243 and .25-06.
    I think I read somewhere that Roy Weatherby had Federal make the No. 215 LMR for his cartridges which were burning over 50 gns of powder.
    I use both in my 7mmRM, 26" barrel. JohnnyK.
     

  3. glassman

    glassman Active Member

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    When ever I go over 65gr I always use a Mag primer.
     
  4. LRHWAL

    LRHWAL Well-Known Member

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    I've generally had better SD's with STD in a 300 Win Mag up to 69grs of powder.

    It really depends - shoot both - check the loads, check the SD's, check the groups...

    Sorry - I've asked the same in the past and eventually found I really needed to try.
     
  5. 30-06 boy

    30-06 boy Well-Known Member

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    i used to use fed 215match primers in my 300wm all the time.i asked the same question about the 300wm.now i start my load development with cci br2 primers(cci standard match)i do however try magnums too.i've shot 80 grains of h1000 with these.and have had no problems.i've seen published loading data that specifies standard primers in 300wm.i have not seen in published data 300 weatherby loads that specify standard primers.they all specify magnum primers.so i would think the 300 wm is the cutoof for standard primers.somewhere around 80 grains of slow burning powder.now your 7mag does not burn as much powder as a 300wm.try them see if they tighten your groups.i would be carefull developing a max load with standards then switching to magnums,back off your powder a few grains.magnums should develop more pressure.jason
     
  6. Varmint Hunter

    Varmint Hunter Well-Known Member

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    When standard primers are marginal on your average sunny day in May, how will they perform with the same large case of powder when its 12 deg in January? I don't know the answer to this question but it causes me to lean towards magnum primers for all hunting cartridges using 65+ grains of powder.
     
  7. 30-06 boy

    30-06 boy Well-Known Member

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    i do all of my loading for my long range deer rifle after gun season.in jan,feb.i do this so the temp,air density,etc are as close to the hunting weather that i will be shooting these loads in.have no problem with igniton at 15 degrees using standard primers..jason
     
  8. .280Rem

    .280Rem Well-Known Member

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    Need? Nope. In fact, some say Winchester Large Rifle Primers are about as hot as other Mag primers. My general rule of thumb is 60 or more grains of powder I use them, but you don't need them. There is a line of thought among some loaders that you do best to "light the powder" with as little fire as possible.
     
  9. Boss Hoss

    Boss Hoss Well-Known Member

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    Well now Counselor the objective is to light the powder as efficiently as possible, ensure complete and consistent ignition every single time in all temperature conditions that will be encountered by the rifle when being fired. I do not know how much experience you have with H1000 but I can tell you that with years of lighting off too many pounds to remember, in many calibers from the 338 Lapua Improved wildcat to several different 7 mag variants I can assure you that H1000 benefits from the use of magnum primers.

    In the development of loading data for mine as well as other folks I have worked with over the years the Winchester primer you speak of is on the hotter side. This I will agree with as not only my testing confirms but one of my good friends who I shoot in competition with works for one of the bullet manufactures and actually told me years ago about the Winchester primers being this way. Based on his recommendations my testing started with WLR primers on load development where ball or large amounts of propellant were required esp in the longer cases. In almost all cases the 215M has provided better accuracy, shot to shot deviations as well as velocities in the temperatures tested here (approx 40 to 95).

    To make the general statement that magnum primers are not needed indicates that your personal experience in this discipline is not comprehensive or complete as it should be. This site is dedicated to the long range hunting and shooting art not short range. You may rest assured that velocity and more importantly at range, shot-to-shot vertical dispersion can mean the difference in success or failure in the field or in competition for that matter. To this end the slower burning and larger capacity cases typically used in this endeavor lend themselves very well to the use of magnum primers.
     
  10. 30-06 boy

    30-06 boy Well-Known Member

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    i found a website a while back where a fellow used a 7mm rem mag to test pressures created by primers.he used i think a 162 amax and h4831 powder.and the only thing he changed was primers to see how much pressure variation there was.he found the fed 215 to be the hottest,the remington magnum primer the lowest.the winchester large rifle primer was the hottest for standards(and was a hair hotter than the remington magnum).the cci200 was the weakest large rifle.now from the lowest peak pressure large rifle primer(cci 200) to the hottest peak magnum(fed 215)there was around 10000 to 12000 psi difference.interesting reading.jason
     
  11. JDY

    JDY Well-Known Member

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    THANKS to all for the info on primers. It is amazing at the knowledge you guys have.
    JDY