Winchester Range Brass Anomaly

View previous topic View next topic Go down

Winchester Range Brass Anomaly

Post by Bigtrout on 5/16/2016, 12:35 pm


I was seating primers in these cases and came across 3 where the primer made a dead stop at the case head.  I tried chamfering (not in photo) with the RCBS deburring tool but the pocket is so badly swaged inward I dared not go deeper than about .015".  Something on some firearm breech seems to have impacted the head pretty hard.  Notice the imprint of whatever it was around the pocket face slightly off center.

Any ideas on what kind of firearm could do this?  I'm assuming it was done upon firing.   The case is otherwise "normal" in all other aspects.
avatar
Bigtrout

Posts : 152
Join date : 2015-06-21
Age : 76
Location : Richmond, VT

Back to top Go down

Re: Winchester Range Brass Anomaly

Post by BaldingEagle on 5/16/2016, 12:42 pm

Possibly a full auto weapon?  Ammunition specific for full auto has a mighty crimp.  
Just a thought.
Doug

BaldingEagle

Posts : 52
Join date : 2016-04-20
Age : 62
Location : Mountain Home Idaho

Back to top Go down

Re: Winchester Range Brass Anomaly

Post by Wobbley on 5/16/2016, 1:13 pm

They just look like they've been crimped.  That takes some energy, higher energy than a typical pistol slide has.  Either they had been crimped by Winchester when loaded or they were fired in a sub-gun, but I don't know of any sub-guns that crimp primers.

Wobbley

Posts : 761
Join date : 2015-02-12

Back to top Go down

Re: Winchester Range Brass Anomaly

Post by james r chapman on 5/16/2016, 1:27 pm

Top secret gov't attack drones carry sub 9mm mini vulcans. The casings could show up anywhere. Snowden confided in a friend of a friend.
avatar
james r chapman

Posts : 1730
Join date : 2012-01-31
Age : 68
Location : HELL, Michigan

Back to top Go down

Re: Winchester Range Brass Anomaly

Post by Wobbley on 5/16/2016, 2:12 pm

Jim needs a tinfoil hat

Wobbley

Posts : 761
Join date : 2015-02-12

Back to top Go down

Re: Winchester Range Brass Anomaly

Post by Bigtrout on 5/16/2016, 2:23 pm

Wobbley wrote:Jim needs a tinfoil hat

Or a switch to Jim Beam.
avatar
Bigtrout

Posts : 152
Join date : 2015-06-21
Age : 76
Location : Richmond, VT

Back to top Go down

Re: Winchester Range Brass Anomaly

Post by Aprilian on 5/16/2016, 3:31 pm

As an engineer, I wonder if that was done on the assembly line.  The primer is pushed in with a die slightly larger than the primer cap until it hits the case and stops.  Same size or smaller die would risk wasting primers.   That looks like the die hit the casing perhaps due to a set up error as the assembly line was switched over, or the primer failed to feed, or the case is too long.

You may never know what happened.  Too bad you don't still have the spent primer in there, that might have given some more clues.   I doubt it was due to the gun it was used in.
avatar
Aprilian

Posts : 211
Join date : 2016-05-13
Location : Minnesota

Back to top Go down

Re: Winchester Range Brass Anomaly

Post by X Ring on 5/16/2016, 5:01 pm

Looks like standard military primer crimp to me.

X Ring

Posts : 3
Join date : 2016-04-17

Back to top Go down

Re: Winchester Range Brass Anomaly

Post by james r chapman on 5/16/2016, 5:07 pm

X Ring wrote:Looks like standard military primer crimp to me.

+1
avatar
james r chapman

Posts : 1730
Join date : 2012-01-31
Age : 68
Location : HELL, Michigan

Back to top Go down

Re: Winchester Range Brass Anomaly

Post by Gunsnjeeps on 5/16/2016, 5:36 pm

Yup, you guys beat me to it.  Just crimped military brass.  Someone bought some surplus 9mm.  There is a tool to trim the crimp out or you can deswage it.  For 9mm I'd go with trim.

Gunsnjeeps

Posts : 31
Join date : 2015-11-20

Back to top Go down

Re: Winchester Range Brass Anomaly

Post by james r chapman on 5/16/2016, 7:05 pm

no offense, but, I'd go for the trash bin... lifes to short to deswage 9mm brass... Wink
avatar
james r chapman

Posts : 1730
Join date : 2012-01-31
Age : 68
Location : HELL, Michigan

Back to top Go down

Re: Winchester Range Brass Anomaly

Post by Guest on 5/16/2016, 8:30 pm

Some LEO ammo has crimped primers too. Those look like commercial headstamps, I'd wager they came from a police range, or were surplus police ammo.

Guest
Guest


Back to top Go down

Re: Winchester Range Brass Anomaly

Post by Bigtrout on 5/17/2016, 7:50 am

james r chapman wrote:no offense, but, I'd go for the trash bin... lifes to short to deswage 9mm brass... Wink

They already went into my disposable recycle bin after taking the photo.  I've got too much good brass to worry about saving those or any others I run into.  I like the production error response.  Seems more plausible than the 9mm Mini-Vulcan.  Thanks for all the responses.

Dave
avatar
Bigtrout

Posts : 152
Join date : 2015-06-21
Age : 76
Location : Richmond, VT

Back to top Go down

Re: Winchester Range Brass Anomaly

Post by noylj on 5/17/2016, 8:21 am

Personally, they look normal to me. Could be a standard primer crimp, but not any sign of over pressure/gun damage.

Now,you're running off a million military rounds and then switch to commercial. Since this is your "cheap" line, you switch out the cases for the correct head stamp but make no other change. It costs you MONEY to take out the primer crimp equipment from the line and nothing to just leave it alone. So, what do you do?

noylj

Posts : 239
Join date : 2012-03-09
Age : 67
Location : SW USA

Back to top Go down

Re: Winchester Range Brass Anomaly

Post by Guest on 5/21/2016, 7:16 pm

I just got a couple thousand 9mm cases from an indoor civilian range. 90% of the cases had crimped primers, with headstamps from all the American manufacturers. I normally ream crimped cases, but I'm going to have to give in and buy a swager. There's no way I'm going to ream all of those short little-bitty cases. No way, no how. 5.56 cases were bad enough.

Guest
Guest


Back to top Go down

Re: Winchester Range Brass Anomaly

Post by Regular_Guy on 5/21/2016, 7:49 pm

The $10 hornady primer crimp remover works well for smaller batches. I wouldn't want to do a couple thousand by hand with it though, but the cutter head will chuck in a drill or cordless screwdriver.
avatar
Regular_Guy

Posts : 75
Join date : 2015-05-03
Age : 32
Location : South Carolina

Back to top Go down

Re: Winchester Range Brass Anomaly

Post by Axehandle on 5/22/2016, 6:25 am

Dillon makes a stand alone nice primer pocket swaging tool.  The Dillon 1050 has a primer pocket swager built in.  I mix and match crimped and non crimped 45 ACP cases in my 1050.  It doesn't blink.  Heard it said that the 1050 swager is good for all primer pockets in that it trues them up.

Axehandle

Posts : 488
Join date : 2013-09-17
Location : Alabama

Back to top Go down

Re: Winchester Range Brass Anomaly

Post by Sponsored content


Sponsored content


Back to top Go down

View previous topic View next topic Back to top


 
Permissions in this forum:
You cannot reply to topics in this forum