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Thread: Is there such a thing as a primer brisance chart for small rifle primers?

  1. #1
    Boolit Master Tripplebeards's Avatar
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    Is there such a thing as a primer brisance chart for small rifle primers?

    I知 running some pretty full loads of H110 in my 450 bushmaster and using Remington 7 1/2 primers. I知 getting about a 100 FPS lower reading every fifth or six round and am trying to rule out my primers or crimp method. I知 wondering if there are hotter primers than the Remington 7 1/2 I知 using since Im under the understanding that hogden recommends a hot primer with a full load.

  2. #2
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    Larry Gibson's Avatar
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    Primer Brisance chart

    Primers are not measured in "burn rate", but by their "Brisance".
    Brisance - is a measure of the rapidity with which an explosive develops its maximum pressure

    Here are the results of a test done to determine the brisance of primers. The testing was apparently done with a homemade ballistic pendulum, which left a lot to be desired. So, don’t take this as gospel but as a rough indicator. It does show there are great differences in primers


    RIfle Primers
    Brand/type_________Power Average___Range____Std. Dev
    1... Fed Match GM215M___6.12______ 5.23-6.8_____.351
    2... Federal 215 LRM _____5.69______ 5.2-6.5 _____.4437
    3... CCI 250 LRM_________5.66______ 4.5-7.4_____ .4832
    4... Winchester WLRM____ 5.45______ 5.1-6.0 _____.2046
    5... Remington 9 1/2M LR _ 5.09 _____ 3.5-6.75 ____.6641
    6... Winchester WLR _____ 4.8 ______ 4.1-6.0 _____.4300
    7... Remington 9 1/2 LR __ 4.75 _____ 3.7-6.25 ____.5679
    8... Fed Match GM210M __ 4.64 _____4.0-5.6 ____ .3296
    9... Federal 210 LR ______ 4.62_____ 3.7-5.5 ____.3997
    10.. CCI BR2 ____________4.37_____ 4.0-5.0 ____ .2460
    11.. CCI 200 LR __________4.28 ____ 3.8-4.8 ____ .3218
    12.. KVB 7 LR Russian_____ 4.27 ____3.8-4.8 ____ .2213
    13.. Rem 91/2 (30 yrs old)_ 4.16 ____ 3.8-4.8 ____.3427

    Pistol Primers
    14 Rem LP ___________4.47_______ 3.2-5.6 _______.5171
    15 KVB 45 LP Russian __3.89 _______3.3-4.2 _______ .2232
    16 CCI 300 LP________ 3.18_______ 2.7-3.5 _______ .2406
    17 Federal 150 LP _____3.11 _______2.6-3.5 _______.2090
    18 Fed Match GM150M_ 3.05 _______ 2.6-3.7 ______ .2299
    Larry Gibson

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  3. #3
    Boolit Master Tripplebeards's Avatar
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    Thanks Larry, I did find that chart you posted but didn’t see small rifle primers listed or my 7 1/2 rem I’m using in the mix to see where I stand.

  4. #4
    Boolit Bub
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    Accurate Shooter posted extensive LR primer tests, but I couldn't find nearly as much info for SR primers.

    Here's the link for the SR primer info: http://www.accurateshooter.com/techn...sure-analysis/

    Here's the link for the LR primer info: http://www.targetshooter.co.uk/?p=1471

  5. #5
    Boolit Master Tripplebeards's Avatar
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    I found this one...

    https://web.archive.org/web/20150304...mer-study.html

    Looks like the Remington 7 1/2 small rifle primer is about the biggest torch on the block.

  6. #6
    Moderator Emeritus robertbank's Avatar
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    OK, I think I am operating now under "information overload". I don't see any comparison of Small Pistol Magnum primers and Small Rifle Primers except the thickness of the Small Rofle Primers is thinker than pistol primers.

    I think I am on solid ground using Small Rifle Primers in place of Small Pistol Magnum Primers. I will load 15 rds of .357mag under my Lyman 358429 bullet and run them over the Chrony. I have data using SPMP. If it works out OK then I should be good to go until next spring when primers might be more available. Up here they do not exist right now except for the ones now selling for around $9.00Cdn plus shipping & taxes. Why do I think we are being raped on pricing right now? I do have a memory and some retailers may end up off my Christmas list!

    Tahnks to all who replied. I will post my results next week. Right now we are being reminded we live in a rain forest and it certainly is aptly named.

    Take Care

    Bob
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    http://www.sksboards.com/smf/index.php?topic=56422.0

    This has a lot of info.

    Steve in N CA

  8. #8
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    i am not sure that the information would be consistent from batch to batch, especially over years.
    [The Montana Gianni] Front sight and squeeze

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    M-Tecs's Avatar
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    Quote Originally Posted by MT Gianni View Post
    i am not sure that the information would be consistent from batch to batch, especially over years.
    I can't speak of other manufactures, however, I know people working on the Federal primer line and others as ballisticians. Federal priming compound is tested to have the same burn and pressure rate same as they do with powder so within the standard tolerances they use they are consistent from batch to batch and year to year.
    Last edited by M-Tecs; 10-04-2021 at 04:43 PM.
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  10. #10
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    Good to know, thanks.
    [The Montana Gianni] Front sight and squeeze

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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
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LRN Lead Round Nose LWC Lead Wad Cutter LSWC Lead Semi Wad Cutter
GC Gas Check