Thread: CCI BR4 vs CCI 400 primer’s

Sorry I have probably missed it
Why are you using the BR 4 if you have more joy with the 400. Is it lack of components? If you still get issues from BR4 after the new firing pin upgrade you could try Rem BR 7 1/2 or Feds

Originally Posted by johnd

Sorry I have probably missed it
Why are you using the BR 4 if you have more joy with the 400. Is it lack of components? If you still get issues from BR4 after the new firing pin upgrade you could try Rem BR 7 1/2 or Feds

Ive got 2000+ BR4’s that I want to use up .

Tahrs onto the issue. Ive had to short chamber guns because of factory ammo/components that was at minimum or below minimum spec.

Originally Posted by Jaco Goosen

Tahrs onto the issue. Ive had to short chamber guns because of factory ammo/components that was at minimum or below minimum spec.

I dunno that was a gimme from the start, but new brass is being used and 400,s go bang so IMHO it's either firing pin weak strike or improper seating. A lot of the time people think they have dud primer batch, but that's not very often the true cause. There's a lot of forum threads across the interweb about this issue with 450's (same same) .
He has done a comparison of new and fired cases with no difference noted.
I think some people have tried making the firing pin diameter smaller too to increase the impact force because it's over a smaller total surface, but TAKE THAT WITH A GRAIN OF SALT.
That's probably more in to your knowledge base @Jaco Goosen than mine.

Originally Posted by johnd

I dunno that was a gimme from the start, but new brass is being used and 400,s go bang so IMHO it's either firing pin weak strike or improper seating. A lot of the time people think they have dud primer batch, but that's not very often the true cause. There's a lot of forum threads across the interweb about this issue with 450's (same same) .
He has done a comparison of new and fired cases with no difference noted.
I think some people have tried making the firing pin diameter smaller too to increase the impact force because it's over a smaller total surface, but TAKE THAT WITH A GRAIN OF SALT.

Thanks for reading and understanding my posts

As I’ve tried to explain, the Chamber / Case dimensions aren’t the problem , they have been checked and verified.
The problem seems to be the force that the firing pin is hitting the primer with .
There is zero , I repeat zero ignition problems with the CCI 400 primers ( new or resized brass ) and multiple different factory ammunition offerings.
The BR4’s just seem to be harder to ignite ( note my Howa seems to hit harder and has zero problems with them )
I’m confident that the spring has gone soft over time , this is an old Tikka T3 ( my suspicion is that it is a very early version because it has open sights installed on the barrel ) that has an unknown history .
Everything gets tired after awhile and I’m in no way unhappy with this Rifle because it shoots very well for the money it cost me .
I’ll give an update when the new spring is installed.

Changed the spring to a 10% stronger one from Gun Works today .
Will give it a run this weekend to see if it makes a difference .

Success

Problem sorted .

Originally Posted by Ground Control

Success

Problem sorted .

Were you originally trying to see if there was a difference in accuracy/velocity/ES between the 400s and BR4s or were you just wanting trying to develop a load with the BR4s?