Primers and Accuarcy

[Painterbolt]

So I've been doing a lot of load development on a 308 I plan on using for competitions. During this I have went out and bought cci 200, s&B, and some cci br2. Out of these primers I'm getting a noticeable point of impact change and pretty noticeable change in accuracy using the br2's. Getting groups at around .8 moa using the br2's and with the cci 200 im averaging about a quarter. My labradar shows them both giving similar numbers, but the accuracy has me kind of lost when there suppose to be the same with the br2 having a large extreme spread. Anyone have a possible explanation for this?

 

[Painterbolt]

Load data
185 bergers, lapua brass, with 42.5 grains of varget

 

[918v]

Primer strength varies between brands and between individual lots, affecting velocity. This affects accuracy and ES. You need to adjust oal or charge weight or both by a hair to get back into the sweetspot.

 

[HoustonB77]

Why don't you just use the 200s? Life's to short to fix things that aren't broken.

 

[natdscott]

So I've been doing a lot of load development on a 308 I plan on using for competitions.

What kind of competition are we talking about?

See what this guy is saying here:

...just use the 200s[.] Life's to short to fix things that aren't broken.

...I modified it a little to be more pointy, but he's giving you the right advice.

Unless you need a load that can shoot in the ZEROES--and reading between the lines, you do not, or you would not be shooting a .308--1/4 Minute is very much as far as you need to chase it for any other sport. If you DO need a zero load, then you probably DO also need a different forum. Or none.

Other than for Benchrest, I can pretty authoritatively state that your ability in competition will benefit more by shooting the rifle in stages, drilling, building good, corrected dope charts, etc. than it will ever be by trying to further refine a 1/4 Minute gun.

Step away from the computer and the loading bench, take the rifle and 50 rds of the best combination you've tried, and go practice something you will be expected to do in competition..

-Nate

 

[waveslayer]

I did some load testing last month and the BR2's were crap! My loads opened up a lot and the SD went above double digits. My 200's have never let me down and more affordable

 

[Painterbolt]

Ya I have no reason to not use the 200's. Just more confused on the substantial difference between the primers when there suppose to be almost the same thing.