Brands known for bullet instability?

[IslandTimes]

Took my liberty mystic out yesterday and had some fun with the family on a 9mm carbine and did a little target shooting with my AR. Took it apart to clean this morning and found a 3 baffle strike inside. I checked with the cardboard test before shooting and didn't see any keyholing, so was wondering if there are any ammo brands that are known to keyhole occasionally.

9mm ammo used:
PPU
Wolf

5.56 ammo used:
Tulammo 55gr
American Eagle 55gr

[66427vette]

How about some info on the host/ hosts.

[IslandTimes]

JR Carbine in 9mm - 16" barrel

16" middy BCM barrel 1/7

There's no sign of an end cap strike either. First time mounted on the AR with a direct thread 1/2x28, but it's been fired for several hundred rounds on the JR Carbine without a problem. Mounted on the JR with a 3 lug mount.

[57fairlane]

tula in .223 has had stability issues in half of the ARs I've shot.

Had 6-7 end cap strikes with that junk

[IslandTimes]

That's what I was afraid of. Ammo is still scare around here, so Tula is about all I've found. Guess its a good thing I just picked up a reloading press for Christmas.

Weird I didn't notice a point of impact change while shooting. Disappointing, but lesson learned. Thanks guys.

[eastern_hunter]

Wow ... that's scary!

I look for holes that are not round when I do the short range unsuppressed check on ammo ... much less instability than keyholing.