CCI 450 vs. BR4 primer cup pressure tolerance

[tooter]

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

 

[brxbrad]

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

 

[RonAKA]

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).

 

[tooter]

Guys,
Thanks for the responses. brxbrad, those articles gave me exactly what I was looking for.