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Thread: CCI small rifle primers 400 v BR4

  1. #1

    CCI small rifle primers 400 v BR4

    I just bought some small rifle primers but have received BR4 instead of the standard 400. Can anyone enlighten me to what the difference is between these two types? The blurb on their website says it's for increased accuracy but why would all their primers not have increased accuracy?
    Many thanks

  2. #2
    I use the bench rest primers , to me it can't hurt , minimising another variable ?
    Right where's those stones , I'll start !

  3. #3
    The BR range are allegedly more consistent

    I have swap between BR2 and CCI200 (the large rifle counterparts) without any change in POI

    I would be surprised if you noticed much difference in a normal stalking load (as opposed to a fully benchrest procedure, neck turning, trimming, annealing, batching, primer/flash hole stadardizing etc etc !)

    for the sake of elf and safety you should always work up to your current charge when changing a component

  4. #4
    I would now always use br4 in my 223. Never thought it would make much difference but tested same load with 400 or br4 primers. On same day, same rifle etc. standard primers index finger nail group at 100yds. Br4 one hole. Tighter tolerances mean tighter groups.


  5. #5
    the br4 are subject to a "better" inspection and i think have a thicker cup-i see a differance in my .22br between the two primers better ES when using the br4,use them same loads.

  6. #6
    Quote Originally Posted by garyw View Post
    the br4 are subject to a "better" inspection and i think have a thicker cup-i see a differance in my .22br between the two primers better ES when using the br4,use them same loads.
    Yes, the CCI-450 (SR Magnum) and BR4 have 0.025" thick cups compared to the 400's 0.020" making them far less likely to crater or pierce with 60,000 psi loads. In my experience, the BR4 is a hot little number and raises 223 Rem pressures and MVs noticeably. That makes it better suited than the standard model to cartridges with large charges than 222/223 etc - the BRs and 6.5X47 Lapua to name but two.

  7. #7
    Regular Poster
    Join Date
    Feb 2007
    Leicester, Mansfield Grantham area
    Primers are as much a variable component as any other in reloading and can alter velocity and trajectory and therefore accuracy quite considerably.

    I have long been an advocate of using primers in the same way as powder to vary a load with great effect.

    We dont choose our case because one looks shinier than another but because of the chemical composition that is most suitable for our particular load. Neither do we choose a Powder just because the local shop has it on the shelf and so with Primers - choose your primer to do the best job possible for the load you are generating.

    A change of primer can in some loads require a drop of 3 grains and the difference in velocity without any increase in pressure can equally improve by 100fps. Use your primers in the same way as your powder and you will be surprised at the difference your loads will provide.

    Here is a basic heat chart - from top to bottom drop about 5-6% in powder and work from there.

    Use it as a guide and add in your own primers when you have assessed them. eg, the Prvi Partizan Primers although burning approximately as hot as the Winchester range do because of their different construction not seem to require a reduction in powder when changing from say Remington. Try for yourself and let us all know your test results as it will expand the above chart considerably.

    Use of Magnum primers is normally reserved for the Ball Powders but I am finding I can use them to great effect in the shorter stumpier cases such as the WSM and WSSM range of cartridges. Logically this should also be valid for the Benchrest PPC cartridges.

    The same is true for the H4831 SC powder in 243 - A Federal Magnum primer seems to provide anything up to 120 fps higher velocities than standard primers yet seemingly without additional pressure.
    do drop the powder weight and build up again.

    Please remember to drop powder weights when changing primers and do also remember that with hot summer weather you need to reconsider all those max loads and take out a little powder.

    A 10 degree rise in temp requires a 5% decrease in powder. If we are going to get such varied weather in coming years it may be best to have a min, intermediate and max load to use dependant on weather temperature.

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