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Author Topic: belted 300 Black out  (Read 656 times)

Offline crashdummy

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belted 300 Black out
« on: October 24, 2013, 12:00:09 pm »
I am known for hoarding  off the wall stuff, but I have inadvertently made a belted 300 BO.
Was fire forming cases in an AR when it locked up big time.  Had to take it home to get it apart and remove the stuck case.
Rifle had fired before the case was fully in the chamber and bolt locked. The cheap old PMC brass expanded .020  beyond
normal in the unchambered section,  forming a nice little belt. Good thing it didn't blow.  The primer disappeared leaving
behind obvious high pressure signs. Darn, can't reload this case!  Everything in the rifle looked good so went out and fired
the rest of the lot with no problems.
I recall a post by another member that experienced this happening, only it ruined his upper receiver as I recall. This old fart was luckier!
Have a GREAT day guys !




Offline justdave

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Re: belted 300 Black out
« Reply #1 on: October 24, 2013, 10:00:40 pm »
Maybe you should consider keeping the single shot for fire forming. That could have quickly gone bad enough to offset the price of the single shot vs. Price of new AR parts.
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Offline crashdummy

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Re: belted 300 Black out
« Reply #2 on: October 25, 2013, 09:50:36 am »
Yes sir
I used the single to form a lot of cases before I got the AR completed, no problems.
I have since used the AR to form another 300 or so with no problems, except this one !
My Armalite AR-10 has a return spring on the firing pin to keep it retracted, the AR-15s don't.
Thanks for your welcome input.