Gunsmithing Is this a firing pin issue?

[XTREM HTR16]

Is this a firing pin issue or something else?

Shooting a new GAP hunting rifle in 6.5 Creedmoor.
GAP Templar VI sheep hunter port
Bartlein 20” 8 twist #3 contour with TBAC CB
Ultra 7 6.5
Now at 94 rounds fired
Shooting factory Berger ammo - 120 scenar, 135 classic hunter and 156 EOL
The 120 and 135 have small primers, the 156 has large.
While shooting yesterday I noticed that the first 3 shots with the small primer, the primer looked good. Shots 4 and 5 the primer looked weird, like it was a light strike or something? The large primers didn’t have that issue.

Pic of 120 scenar brass, shot #1 at right and work to the left.
Next to them are factory rounds.

Here are the chrono read outs from the Oehler:

 

[XTREM HTR16]

Here is the 135 brass and chrono results:

 

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And here is the 156 brass

 

[Supersubes]

They look like they’re right on the verge of piercing.

 

[1moaoff]

they look inconsistent even in the same lot.

 

[XTREM HTR16]

Could it be pressure issue from heat? I fire 5 rounds in about 2 minutes, and the primers from the first three shots when the barrel is cool Look good. Then shots 4 and 5 have the primer issue.

 

[XTREM HTR16]

Gotta love a fast response from the owner of the company! George just confirmed its a issue with the medium firing pin and the SR primer loads.

Total rookie mistake, thx for bearing with me. Now to sell some ammo....

 

[Jscb1b]

Good deal.

 

[FisherT&C]

It would be interesting to see if the results could be duplicated without the supressor.

 

[sinister]

They look like they’re right on the verge of piercing.

Yup, the 120s and 135s both have a raised lip (primer cup metal flow) around the firing pin impact point as well as looking like pressure pushed the firing pin back.