.243 primer question

Discussion in '6mm, 6.5mm, and .25 Cal (Not 6BR)' started by hillbillydruggist, Feb 2, 2019.

  1. hillbillydruggist

    hillbillydruggist

    Joined:
    Nov 5, 2018
    Messages:
    143
    I have been loading 300win mag using CCI 250 primers, I am about to start loading for 243 win, can I use the 250 primers in the 243? would it be dangerous?

    thanks
     
  2. SPJ

    SPJ Silver $$ Contributor

    Joined:
    Feb 17, 2018
    Messages:
    4,209
    What does CCI recommend?
     
    hillbillydruggist likes this.
  3. hillbillydruggist

    hillbillydruggist

    Joined:
    Nov 5, 2018
    Messages:
    143
    only 200 I think
     
    Idaho-Lefty likes this.
  4. SPJ

    SPJ Silver $$ Contributor

    Joined:
    Feb 17, 2018
    Messages:
    4,209
    Personally
    I don't start load development with magnum primers.
    after the initial ladder and initial seating, therefore I've established a base load then I have tested primers side by side in 3-5 shot groups to note improvement or decline.
    (Caution) is recommended when selecting primers to test" do a little research...BE SAFE !
     
  5. hillbillydruggist

    hillbillydruggist

    Joined:
    Nov 5, 2018
    Messages:
    143
    Thanks, I will
     
  6. 243winxb

    243winxb

    Joined:
    Feb 6, 2006
    Messages:
    1,514
    A mag primer is my choice for all ball powders.

    The 243 Win deserves the best. Imo. BR2 is what i use. I use IMR 4350/4831 & H4350 (not ball)

    A mag primer may move the bullet sooner on firing.

    Dont know if it matters or not. Needs testing.

    20190202_085603.jpg

    Mag primer not dangerous. Start low, work up.
     
  7. SPJ

    SPJ Silver $$ Contributor

    Joined:
    Feb 17, 2018
    Messages:
    4,209
    You can bring up older threads in the 6 br page about primer tests from Nature Boy and myself on how we went about it.
     
    LAH and hillbillydruggist like this.
  8. Idaho-Lefty

    Idaho-Lefty

    Joined:
    Jan 12, 2017
    Messages:
    189
    I have had NO problems getting .2-.3 tenths, 3 shot group accuracy, out of the standard, CCI 200's, using IMR 4350 or, N-160, in a factory stock Tikka .243 W/ 80 Sierra Blitz's #1515 or, 87 grain V Maxes, in my .243 win. If you "need" to use up the Mag Primers start at,.. a couple of grains UNDER as noted above.
    I use F-215's and some WLR Mag's, in my 270 WSM, but never, in standard Cart's.
    CCI 200's and Federal F210's, are pretty highly "Rated" Primers ! Not sure if, the Match/ BR Primer's "buy" you much extra accuracy, unless shooting them in a $5,000.00+ Match Rifle, as I could never, "see" the difference, in my Fact stock or, semi customs.
     
    Last edited: Feb 2, 2019
    Bc'z and hillbillydruggist like this.
  9. urbanrifleman

    urbanrifleman Gold $$ Contributor

    Joined:
    May 25, 2016
    Messages:
    2,039
    Would probably work awesome with w760.
     
    hillbillydruggist likes this.
  10. K22

    K22

    Joined:
    Jan 24, 2011
    Messages:
    1,885
    I can't answer your specific question on magnum primers since I don't use them in any of my 243's. I will offer that I've had my best results with Federal 210 standard primers with IMR 4350, IMR 4064, and H4895* (*bullets 80 grain and under) in the 243.

    I use to use Federal 210 match primers but was unable to get them so I tried the standard large rifle Federal 210 primers. I was pleasantly surprised to find no difference in group size plus the standard primers are cheaper.
     
    hillbillydruggist likes this.
  11. Dgd6mm

    Dgd6mm Silver $$ Contributor

    Joined:
    Sep 11, 2007
    Messages:
    3,344
    I use them in my .243 with H1000. 5 shot 1/2 MOA accuracy at 100 yards. Not the best, but good enough for banging steel for me.
     
  12. fyrewall

    fyrewall

    Joined:
    Oct 28, 2017
    Messages:
    649
    On occasion I use CCI 250's or CCI 34's in my .243. I do this in real cold days when temps are under 20 F. I load 87 Vmax's with 4000 MR. The CCI 34 is a recommended primer for 7.62X51 (.308) that might be used anywhere and 250's might be similar. In any event, things work out just fine with no bad stuff and great accuracy. Some time ago a study was done on measuring primer blast waves using a transducer and the 250's were somewhat more frisky than 200's.

    https://arxiv.org/ftp/arxiv/papers/1102/1102.1644.pdf

    This link provides actual measurements. The CCI 200's were measured at 371.4 psi, the CCI 250's at 520.3 psi. No info on the CCI 34's. I bought a large amount of these a few years ago at a LGS that were not selling.

    I have heard some funny stuff that I cannot understand like magnum primers provide less velocity than standard primers with all other things being equal.

    To go off on something else, that Rem 7 1/2 is one frisky little primer.
     
    Last edited: Feb 2, 2019
    MrMajestic and hillbillydruggist like this.
  13. SPJ

    SPJ Silver $$ Contributor

    Joined:
    Feb 17, 2018
    Messages:
    4,209
    After testing several primers my personal feelings are that CCI br primers burn very clean and consistent with a hard cup that doesn't pierce.
    Fed blue box primers burn well however leave a tar like residue in the primer pocket.
    I've tested 6 different primers side by side against a base load, my impression is that all but one I could build around.
    The magnum primers actually grouped a little better during testing ( of my personal rifle Not yours) I may use them moving forward in place of adding powder.
     

    Attached Files:

    Zero333 and hillbillydruggist like this.
  14. fyrewall

    fyrewall

    Joined:
    Oct 28, 2017
    Messages:
    649
    Looking at past stuff the CCI 34's have less anvil protrusion than CCI 250's and that might give rise to "NATO sensitivity". The LGS guys claim the 34's are like magnum primers and I am using my remaining primers with 4000MR powder.
     
    hillbillydruggist likes this.
  15. Zero333

    Zero333 Silver $$ Contributor

    Joined:
    Dec 24, 2015
    Messages:
    1,963
    You can use ANY Large Rifle primer in the 243win, Magnum or standard. Work up the loads accordingly.

    If you have a 243win load that's at MAX and you want to change primers, I would back it off a little and re-test with new primers. Otherwise there is no problem using magnum primers. That goes for every cartridge.
     
    Idaho-Lefty, Mark W and murray brook like this.
  16. South Pender

    South Pender

    Joined:
    Jan 14, 2015
    Messages:
    202
    Has anyone tried the newer Peterson SRM (small primer pocket) brass and small primers with their .243W?
     
  17. ballisticxlr

    ballisticxlr

    Joined:
    Sep 24, 2018
    Messages:
    137
    Zero333 nailed it.

    FWIW, I've used magnum primers with good effect with ball powders in everything from .223 to .243AI. I don't use them with stick powders but that's because they're not necessary. With BL-C(2) and light bullets the hotter primer cut my SD's.

    I don't think a SRP is sufficient to light off the size of powder charge in a .243W. David Tubb did a little testing that seemed to demonstrate this too. Above, as I recall, 35 grains of powder he saw sub-optimal performance with SRP's.
     
  18. rafale

    rafale

    Joined:
    Jan 9, 2015
    Messages:
    63

    Yes we tried it ! They worked well with Vitha N 165 (single base) and my friend was shooting a heavy load of Swiss powder RS 70 and a Scenar
    105 L at 3330 f/s ! The accuracy was not bad ,well under 1/2 Moa (10 rounds) at 300m . We are using for both powder CCI 450 mag .Having said
    that, the accuracy with Lapua brass is better but this is only do at more experiments.

    Michel
     
    Last edited: Feb 11, 2019

Share This Page