do primers effect accuracy?

Discussion in 'Reloading' started by diderr, Jan 31, 2008.

  1. diderr

    diderr Well-Known Member

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    do primers effect accuracy? like if i used CCI, win, or fed. will i see any difference in accuracy? I'm currently using CCI lrm, and I get reliable ignition.
     
  2. britz

    britz Well-Known Member

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    everything affects accuracy to some extent. Tell us what cartidge your shooting and some of the experts here can tell you what they have had the best luck with.
     

  3. Buffalobob

    Buffalobob Writers Guild

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    How do you know that?

    If you have a moderately accurate rifle then at distances of about 500 yards and beyond you may see differences in ignition. Or if you are a Tekno Weenie and cannot shoot your rifle without a chronograph, you may see velocity changes due to erratic ignition levels with a given primer. This will be evidenced by a bullet moving out of group or out of velocity spread when you believe it should have been in the group. If you are very good and have a very good rifle then you may be able to see differences at 100 yards on your bullet groups. Some primers are hotter than others. Some loads of powders and bullets like cool primers and some like hot primers.
     
  4. johnnyk

    johnnyk Well-Known Member

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    diderr,
    I have found different primers give you different accuracy levels with the same given bullet and powder charge. Looking back through my reloading journal I see that in July of 02 I was shooting the 160gn Sierra GK in my 7mmRM Sendero. The powder was RL19 and I tried both Remingtons 9.5M and CCI BR2's. I cleaned the barrel before each 3 3-shot test and never allowed the barrel to heat up. The outside temp was cooler than normal that day (I make note of temp/wind and other factors).
    I was shooting 61/62/63 gn of powder with each primer. With the R9.5M my groups ran .9035/.6645/.9875 and with the BR2's they ran 1.220/1.115/1.320. While this is only a small sampling and may not be enough data for some, it is/was enough for me. Primers do make a difference. JohnnyK.
     
  5. eddybo

    eddybo Well-Known Member

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    A primer is just another componant like a bullet or a powder charge or even a case. Change one componant, and there can be consequences either good or bad. If you have an established load, changing primers can affect accuracy. That said, you can work up a very accurate load with any good primer.
    I have my favorite brand of primers as do most who reload, but I think it is more of a ford chevy debate.
     
  6. royinidaho

    royinidaho Writers Guild

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    Short answer: Yes!
     
  7. diderr

    diderr Well-Known Member

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    My current load shoots .35's at 100 with 190 smk's, cci lrm, 65grns of h4831sc and norma brass out of a 300 wsm. but I want to try some new primers next time I need to buy some. any suggestions?
     
  8. steve4102

    steve4102 Well-Known Member

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    Fed 215M! Sorry, just kidding, these are my favorite Mag primers, but they are no longer available.
     
  9. overbore

    overbore Well-Known Member

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    The quick answer is

    YES; they most certainly do. See my table of the primer tests producing ES variables. Overbore
     
  10. rotorhead

    rotorhead Well-Known Member

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    With 4831sc I would try remington.