CCI 450 vs. BR4 primer cup pressure tolerance

Discussion in 'Reloading Forum (All Calibers)' started by tooter, Jan 17, 2011.

  1. tooter

    tooter

    Joined:
    Jun 7, 2009
    Messages:
    108
    I've been using CCI 450 primers in my 223AI and 6mm Dasher but just picked up some BR4s to try for group comparison. Before I load them, can anyone comment on cup thickness and pressure resistance differences between the two? Just trying to get a feel for how much I should reduce the starting loads.

    Tooter
     
  2. brxbrad

    brxbrad

    Joined:
    Feb 22, 2010
    Messages:
    331
    Here's a good article for ya.....Primer demensions are in this article

    http://www.jamescalhoon.com/primers_and_pressure.php

    Also a great article by German Salazar...also Includes info about br4

    http://riflemansjournal.blogspot.com/2009/06/primers-small-rifle-primer-study.html
     
  3. RonAKA

    RonAKA

    Joined:
    Apr 16, 2008
    Messages:
    1,160
    You should not have to reduce loads. The 450 is a magnum primer, while the BR-4 is a standard like the 400. It just has increased quality control (according to CCI).
     
  4. tooter

    tooter

    Joined:
    Jun 7, 2009
    Messages:
    108
    Guys,
    Thanks for the responses. brxbrad, those articles gave me exactly what I was looking for.
     

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