BR4 vs CCI 450 comparison.

[Dezelrig]

Has anyone here tested the differences between these 2 primers in Alpha OCD brass to see which primer craters easier? How were the SD’s or other differences?

 

[TxWelder35]

They are the same cup thickness

 

[mcfred]

If you have both kinds of primers and a chronograph, how about you test them yourself and tell the rest of us if there is a difference? If you want to know, then there are others that probably would like to know too.

 

[dirthead1]

I’ve tested both in 6.5 CM Lapua brass. BR4 was slightly lower ES and SD. If you have equal access to both I would pick BR4. Otherwise take whichever you can find.

 

[Supersubes]

As mentioned, the cup thickness is the same. I also think the brisance is identical between them. For the lots I have, i prefer the 450’s, but they're functionally identical.

 

[Dezelrig]

If you have both kinds of primers and a chronograph, how about you test them yourself and tell the rest of us if there is a difference? If you want to know, then there are others that probably would like to know too.

I have a lead on some BR4’s, but no 450’s.

I saw that the 450’s are slightly taller, but have the same thickness:

Primers And Pressure