tack921
tack921
28 posts
Joined May 2012

.308 Reload COAL

Variables:
168gr. projectiles loaded to spec for .308 with COAL @ 2.800"
All rounds/cases checked through case check die

Situation:
My .308 rounds load fine. But the problem occurs when cycling an unfired round, when I go to pull that charging handle back and eject the unfired round the BCG does not unlock resulting in an unfired round stuck in the chamber. I have to physically bang the stock against a sturdy desk or concrete to force the BCG to unlock and eject the unfired bullet. When loading Federal factory ammo (COAL 2.720") it loads and ejects just fine. Sometimes when firing reloads this fail to eject happens as well.

Question:
Could the variances between what the reloading data says as the COAL (2.800") and factory (2.720") be what is causing the failure of the BCG to lock/unlock? Or something else?
tack921
tack921
28 posts
Joined May 2012

RE: .308 Reload COAL

Also to add into this, folks I talked with said I should get a Small Base Die but I didn't see any of those on the Dillon page. My resizing die is already down to the shell plate holder so I can't imagine it's a resizing issue.
rob tipping
rob tipping
28 posts
Joined January 2013

RE: .308 Reload COAL

yes you need to lower your oal try by 5k less at a time until they consitantly cycle the same . or you can buy a comparater and measure your chamber to determen your chamber length . you can also load a dummy rnd 5k less color the bullet with a black perm marker see how it chambers if it takes off alot of the marking lower oal by another 5k then try again try to stay off the lands by 2 to 5 thou .hope this helps youe problem .
sjnewkirk
sjnewkirk
3 posts
Joined October 2015

RE: .308 Reload COAL

check the case gage again. It doesn't take much of a deviance to create this problem. Had this exact situation with .223 and .308's. That is when I learned what a case gage was. probably not an OAL issue as chambers usually are very tolerant in this regard. In my case a 1/2 turn of the die fixed this problem.
tack921
tack921
28 posts
Joined May 2012

RE: .308 Reload COAL

@sjnewkirk

I assume when you say "case gage" you mean the sizing die, correct?

I have the sizing die set to touching the shell plate holder, how can I determine the correct depth to set the die to?
lcb
lcb
289 posts
Joined September 2007

RE: .308 Reload COAL

Check out Dillon's case gage.  One should have a case gage for every rifle caliber they load.  It will help with neck sizes too long (stretch's each time the case is shot), check overall length of the case, etc.


.308 Winchester Case Gage 12867 $27.95

dillon
Administrator
dillon
3,021 posts
Joined July 2007

RE: .308 Reload COAL

See if a sized, empty case fully enters and freely extracts from the chamber. If it does not, then the size die needs to go down an additional 1/16th to 1/8th turn. The case gage is a chamber with steps cut at either end. The step at the primer end of the case shows minimum and maximum headspace. You should size cases to minimum for use in a semiautomatic rifle. Search through our videos for the one that shows how to use a case gage.
tack921
tack921
28 posts
Joined May 2012

RE: .308 Reload COAL

Dillon,

Empty cases cycle fine. I have the sizing die down and making contact into shell plate holder. Tonight I made a batch of 10 dummy test rounds. Cartridges to spec (2.00"-2.01"), COAL 2.75", projectiles 168gr. Cycled using either MagPul or MilSpec mag and cycling by pulling charging handle.

In the first two cycles of manually ejecting the rounds, I had two hang-ups. After that the problem went away. The bolt fails to fully go forward and thus locks, and does not allow for manual extraction. Still had to bang the stock down to get them to eject. Symptoms indicative of a headspace issue. But with the sizing die at max depth I'm afraid any further will result in damage.

***Update: I went and lowered the sizing die 1/8 turn more. And ran 30 unsized cartridges. Third to the last I apparently find one that was not to spec and it got stuck in the die. Tried following your video...and made it worse. Fml***
porkeypapa
porkeypapa
21 posts
Joined July 2012

RE: .308 Reload COAL

I'm in 93301. are you close?????
dillon
Administrator
dillon
3,021 posts
Joined July 2007

RE: .308 Reload COAL

If you were unable to extract the stuck case from the size die, contact us for a return authorization to send the die in to us. We will extract it.

If sized,empty cases freely chamber and extract, then the size die is not the culprit. Either the COAL is too long, and the ogive of the projectile is getting jammed into the origin of the rifling, or the applied crimp is excessive. To test, see if a round with the bullet seated, but not crimped, chambers and extracts easily. If it won't extract, seat the bullet deeper.