best sr primers

tnbowhunter

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You’ll likely get better advice than this but I would just pick one and go. I personally havent seen much of a difference from one primer to another. I just grab whatever the local store has at the time. I usually get match primers for target loads if available locally but many times they aren’t and I haven’t seen a noticeable difference switching back and forth. I suppose if a person was going for absolute best accuracy you could try a few different ones and run the loads through a chrono to see which one gives you the best es.
 

Codiekfx400

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Cci 450 or Remington 7.5 would be my choice. That is a lot of powder for a small rifle primer to light so a hotter type primer would be my choice.
 

jeepwilson

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The Remington 7.5 are definitely tougher. I had trouble in my bench gun (6BRX) blowing a hole through the primer where the firing pin goes through the bolt face. I tried multiple primers and once I went to the Remington 7.5 it has never happened again.
 

Pittbull46

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Thanks for the help going to try 450 with the Peterson Brass how much less powder would I need
 

Supersubes

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Thanks for the help going to try 450 with the Peterson Brass how much less powder would I need

Cci 450’s (and br-4) have the same amount of priming mixture in them as a cci 400. Only thing that makes them “magnum”is the thicker cup to withstand pressure. No change in the load is needed. The 450 and br-4 are identical by the way. Don’t waste money on the br-4.
 
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TBagAMouseTrap

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Cci 450’s (and br-4) have the same amount of priming mixture in them as a cci 400. Only thing that makes them “magnum”is the thicker cup to withstand pressure. No change in the load is needed. The 450 and br-4 are identical by the way. Don’t waste money on the br-4.
I read an article a few years back that said the BR-2 and the 200s were the same primer. The BR-2 was just the ones produced when the more experienced work crew was on the clock. Thanks for this info on 450/BR-4.
 

Forward543

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Get your powder charge, then adjust length for accuracy. Then run a test on as many primers as you would like in 5 shot groups over a chrono. Every load seems to have a primer preference. I have good luck with cci primers. But have also found rounds that like winchester or federals. I think you can lower sd and es with a primer test.