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Daniel_187
06-29-2014, 13:13
So I reloaded some .30 carbine rounds for my Auto ordnance M1 carbine. Well they run good, but all of a sudden the bolt will not go fully into battery. I drop the mag, lock back the bolt and notice very thin brass rings jammed in the chamber. The load is:

13.5 GR of IMR 4227
Primer Winchester small rifle
bullet 110gr sp
OAL 1.685"
Brass is a mix of PPU and Augila
And a light taper crimp
Full length re-size
all trimmed to length

Cheap brass maybe?
Irving
06-29-2014, 13:58
Do you have a case gauge?
Great-Kazoo
06-29-2014, 15:37
Neither Privi or Aquila are cheap brass. Outside of having a case gauge. Pull your Bolt assy and see how the reloads chamber .
eneranch
06-29-2014, 15:47
Brass Rings ?? Was the brass originally crimped and now the metal has worked & it's separating??
Daniel_187
06-29-2014, 16:48
Yes, there are brass shavings like little thin rings of the case mouth that are jammed into the chamber. No I don't have a case gauge. The rounds chamber fine till I get a little brass ring from the case mouth jammed in the throat. Is it possible the camber is out of spec? I will run some factory ammo through it and see if it does it with the factory ammo.
DSB OUTDOORS
06-29-2014, 17:40
That's usually an over crimp issue. You might try backing off the crimp just a tad. Also if you did not trim your case just a bit. It could be thin from previous crimp.
Great-Kazoo
06-29-2014, 18:12
Yes, there are brass shavings like little thin rings of the case mouth that are jammed into the chamber. No I don't have a case gauge. The rounds chamber fine till I get a little brass ring from the case mouth jammed in the throat. Is it possible the camber is out of spec? I will run some factory ammo through it and see if it does it with the factory ammo.

If you're not using and or have access to a case gauge, you should be checking using the chamber of your carbine. Thinking the brass is sized correctly and knowing can be 2 different things.
Daniel_187
06-29-2014, 19:21
The only case gauge I found were only for OAL
http://www.lewilson.com/caselengthgage.html

Like this one. I trim them all to length with this
http://www.midwayusa.com/Product/251723/lee-case-length-gage-and-shellholder-30-carbine