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I admit I haven't measured them, but here is the word I go by:400 are non-Magnum but thick cup primers.
I was truly surprised by my testing of primers in 223. I shoot 80VLD with a pretty stout load of Varget. After years of using 205 GMM primers, I wanted to switch to the CCI in order to have a harder cup but didn't want to adversely affect what had been a very good load. Tested with same lots of powder, bullet and brass. I loaded same loads (all measured on A&D scale) with my usual FGMM, CCI450 and CCI400. All were ten shots over chronological (magneto speed V3). The GMM came in 2nd, while the CCI450 came in a far behind last place. The lowest SD and best velocity came from the CCI400.
I would suspect that your test might even be different from mine. In other words, try them all and then decide which way is best.
Yeah, years ago the price difference was not that great. Today depending on where one shops I see the following numbers.One thing not mentioned is price difference between the BR-4 and 205M. I'm switching to the 205M when possible because they're much cheaper than the BR-4. They also seem to shoot at least as well, or better in my 223 and 6br.
It's a rifle I shoot for matches only. One match 1/2MOA targets 300-600 and other 1 MOA targets 600,800,900 & 1,000.How did the groups look ?
Not a magnum primer but the cups are as thick as CCI magnum primers.... Useful in situations like using an automatic to prevent slam fires.... Testing is the only way to know what works best in your rifle....Yes for a bolt gun. I didn't now BR 4's are a magnum primer
Thank you for the replies I appreciate it