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Thread: Primer Hardness?

  1. #1
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    Primer Hardness?

    Is there a generally agreed upon order of primer hardness among CCI, Remington, Federal and Winchester? I was led to believe that Remington is the hardest and Federal the softest? So maybe Rem, Win, CCI, Fed?

  2. #2
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    See the blue shaded box near the bottom

    https://www.accurateshooter.com/tech...sure-analysis/

    some info along the lines of what you are asking.

  3. #3
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    i would take exception to their small rifle limitations.
    cci400 and win sr work well in modern rifles..no 44000psi limit.

    Quote Originally Posted by glp View Post
    https://www.accurateshooter.com/tech...sure-analysis/

    some info along the lines of what you are asking.

  4. #4
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    Iím still trying to figure what the pressure is with regard to an .062 flash hole. PSI be damned.

  5. #5
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    If the pressure is 50,000 psi then the pressure within a .062 primer hole would be 83 psi.

  6. #6
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    Quote Originally Posted by Wilbur View Post
    If the pressure is 50,000 psi then the pressure within a .062 primer hole would be 83 psi.
    Interesting! How did you calculate that Wilbur?

  7. #7
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    I did a small test to see if different primers would reduce cratering in my 30BR on a 700 action.

    In particular, I was interested if the primers that are advertised as milspec to reduce the chance of a slam-fire in ARís would show less cratering. I tried CCI #41 and Fed 205M-AR, with Fed 205M, 205, Winchester small rifle, CCI small rifle, CCI BR-4, and Rem 7 1/2 as standards.

    The only one that visibly had smaller craters was the CCI #41. The 205M-AR did not appear any different than the 205 or 205M.

    No, itís not scientific. I didnít measure thickness, velocity, or anything else. All I did was load them the same, fire, and look at the craters. ďYour mileage may vary!Ē

    Regards, Ron

  8. #8
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    Does primer cup hardness have much to do with consistency; i.e. one brand gives more consistent velocities shot to shot than another brand does? All other factors being equal.

  9. #9
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    You know, you can do a search on all these factors and come up with lengthy tests and conclusions instead of speculation.
    https://precisionrifleblog.com/2012/...ion-reloading/

  10. #10
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    Quote Originally Posted by FBecigneul View Post
    You know, you can do a search on all these factors and come up with lengthy tests and conclusions instead of speculation.
    https://precisionrifleblog.com/2012/...ion-reloading/
    I can but I'd just as soon go direct to those likely to know. Someone on another message board was asking about primer variation and that reference was posted elsewhere also. The obvious answer to whether or not primers make a difference is to take your best load and simply try different brands keeping in mind that a different lot of the same brand may not give the exact same results.

  11. #11
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    Don't know if that's right or not but suspect it's not. I just calculated the area of a .062 inch round hole and applied that to 50,000 psi. I realized after I posted that the total pressure on the primer would be the result of the diameter of the space inside the primer...but who cares. If the primer gives up the ghost you have two choices...get a tougher primer or reduce the powder charge.

  12. #12
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    in the br game. It DOES NOT MATTER.
    what matters is what happens on the TARGET.
    SO WORK UP A LOAD with each PRIMER and then go shoot the best.

    or do what most do , shoot a primer KNOWN to give uniform great results
    that tends to be federal small rifle or small rifle match.
    specific loads some time work better with a different primer.
    an example is the cc450 in 6mm dasher and rl15.

  13. #13
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    Quote Originally Posted by Wilbur View Post
    If the pressure is 50,000 psi then the pressure within a .062 primer hole would be 83 psi.
    If the pressure inside of a case the instant before the bullet departs is 50,000 psi or pounds then it's equal in all directions, no?
    Last edited by antelopedundee; 07-23-2019 at 03:33 PM.

  14. #14
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    Lightbulb Perhaps......

    ......Wilbur meant to type "83 pounds" ??

    I recall Jerry Stiller writing a very concise Precision Shooting article, concerning primer cratering/blanking and reducing the boltface firing pin hole diameter.
    Anyone else remember?

    Kevin

  15. #15
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    Quote Originally Posted by antelopedundee View Post
    If the pressure inside of a case the instant before the bullet departs is 50,000 psi then it's equal in all directions, no?
    At a rate of 50,000 pounds of force per square inch of area, or 25,000 pounds of force per half of a square inch etc etc.

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