.300 Blackout ammo concern

M

mohr308

New member
I took my bolt action Ruger 300 blackout to the range today. I fired some Hornady factory 110gr. supersonic and some reloads also 110 hornady supersonic. I'm inspecting some of my brass and found some with primers pushed back, even factory loads. See the image.
a06d6d1db86ccb5b6e3e396d991244d2.jpg
 
Could the chamber be a bit short?

In other words, the bullet's already touching the lands when it's chambered?

A 'smith probably has one of the OAL gauges used to determine these things.
 
If anything, your chamber may be oversized, but their is probably nothing wrong. Quite number of things can cause the round to push o primEr back a bit before the full impact of pressure c aes the cash to be fully forced against the breech before chamber pressure overcomes the primer pockets pressure.protruding primers s not an absolute sign of pressure. It usually means that primers are loose, chamber are not hear s spacer properly, or chamber pressure is too low to function as a expected.
 
Here is some other info I forgot, the first 3 factory rounds I pulled the trigger on didn't fire. After looking at the strike on the primer, it was shallow. I actually used my wife's bolt from her .223 ruger to fire my reloads, but then switched back to my bolt and continued with firing. The case on the right with the protruding primer may have been from her bolt. But the factory rounds wouldn't fire with my bolt.
 
Guess I just answered my own question maybe. From the bolt face to the tip of the firing pin, mine is .090", my wife's is .075". I guess that's why the factory loads won't fire and some miss fires on my reloads.
 
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