CCI vs. BR4 Match Primers

peeplwtchr · Feb 27, 2021

Hi All-

I have read that changing primers can effect the same load, and that match primers are supposed to be more consistent, so I tested the two types of SRPs I had.

- .223
- Same powder drops (Varget, Trickled)
- LC brass, 1.75 trim
- No crimp
- 55gr Hornady BT w/c
- 1:8 twist
- 100 yds
- 7 shot groups
- Shot from a sled

Is there any type of conclusion here? The BR 4 seems to be tighter groupwise?

They are both 2 moa groups, but one is vertical and one horizontal. Seems that might indicate something, I don't yet have enough knowledge of vertical vs. horizontal grouping.
Thanks

Skeptic13 · Feb 27, 2021

I am not sure that shooting 55 gr Hornady FMJ bullets from range brass is the best test to tell you if there is a difference between the two primer types. I done similar load testing with these different primers and could not tell any noticeable difference. To tell the difference I think you need to be shooting match bullets out of quality brass like starline to see if you can get your .6" group down to .5". Just a thought.

AJC1 · Feb 27, 2021

Match primers are a level of consistency for people looking for that last degree. If your using factory chambers and range brass any primer will do.

JFrank · Feb 27, 2021

peeplwtchr said:
Hi All-

I have read that changing primers can effect the same load, and that match primers are supposed to be more consistent, so I tested the two types of SRPs I had.

- .223
- Same powder drops (Varget, Trickled)
- LC brass, 1.75 trim
- No crimp
- 55gr Hornady BT w/c
- 1:8 twist
- 100 yds
- 7 shot groups
- Shot from a sled

Is there any type of conclusion here? The BR 4 seems to be tighter groupwise?

They are both 2 moa groups, but one is vertical and one horizontal. Seems that might indicate something, I don't yet have enough knowledge of vertical vs. horizontal grouping.
Thanks

I find the 400's a softer cup primer, BR4 a thicker cup also IMO a touch hotter also your rifle likes the br4.

peeplwtchr · Feb 27, 2021

South Prairie Jim said:
I find the 400's a softer cup primer, BR4 a thicker cup also IMO a touch hotter also your rifle likes the br4.

Thanks, I know about the BR4 cups thickness, why I decided on them as my go to. But you said my rifle likes the BR4 better. This is what I am looking for with this post; why is BR4 better in this rifle in your opinion?

mrawesome22-250 · Feb 27, 2021

It would take more than one group to prove which primer the load prefers.

Increase, or decrease the charge weight, and results could very well flip.

You have nothing statistically relevant with a sample size of one.

AJC1 · Feb 27, 2021

If the cup is your primary concern the 41 is designed to be the hardest and tuffest. Lots of 450 fans out there in competition.

JFrank · Feb 27, 2021

The group is a little tighter, the. lazy 400's may need a tiny more powder to come together then perhaps over take the others for consistency.

Added for guests; as with any component change a node can move slightly the re loader must test a bit on each side to re establish.

My 2 cents

Bacon buster · Feb 27, 2021

Br4 is a better primer imo. I’ve seen some in depth testing of primers and looked into it quite a bit. Under normal conditions most any primer will do but add in extreme cold mixed with certain powders and you’ll find that hangfires or FTF will occur. It’s part of tuning your load and should be treated like any other component or process. Johnnys reloading bench did a great test on primers. Check it out on you tube

Blue68f100 · Feb 28, 2021

When I tested primer in my 6.5 CM the CCI & BR4 were a wash. The Fed GM205M won the test.

How did you test. Shoot all of 1 than the other? Best to shoot round robin so barrel fouling is evened out.

JFrank · Feb 28, 2021

I was reading a thread posted by one of the top BR buys in the country, the point he made towards primers is to test them all.
He also mentioned that through years of testing IHO the Receiver dictated what primer not necessarily the barrel.
In others words two identical rifles and same calibers may like seperate primers.
He also has mentioned over time that as soon as he thought he had it figured out a barrel would prove him wrong.

Morning thought....

CCI vs. BR4 Match Primers

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