New barrel, odd primers

[JGSFAB]

I can tell by the primer strikes it's a gen 5 striker. It's not the regular thin tip striker... and the striker isn't the problem. Looks like some really thin primer cups.

That's how I feel. They look good fired from the AR9s (not extruded) but Glock and their infinite wisdom.

 

[Koda]

It's between Sammi GO and NoGo lengths.
It's getting great ejection. Every once in a while it has a FTF so it could be a little tight.
I wrote it off as JHP issues. Round nose no problem.
I'm sure the factory barrel is way looser.
I might have a production grade finish reamer, it's been the fix for tight chambers.

My take for now is the load is too hot. If both chambers are in saami spec, the handload should work safely in both.

 

[JGSFAB]

From Alliant Powder Guide (2004)

115	FMJ	Alliant	Unique	5.5	1168
Remarks: min OAL (inches): 1.12; 33,200 psi

I'm at 5.0-5.1 grains. They have a "light" crimp so I doubt its bullet push back. Other loads are pushing 6 to 6.5 gn .