Thread: CCI BR4 vs CCI 400 primer’s

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.