How is military brass crimped? - The Firearms Forum

larrymac1 · 12-19-2011, 02:28 PM

I can find tons of information about how to swage the pocket. I don't have a problem with that. I just got curious about how the crimp is placed in the casing to start with. Running 2000 .223 cases through the resizer just got me to thinking. I know why they do it, but just curious about HOW.

woolleyworm · 12-19-2011, 07:29 PM

Welcome to TFF Larrymac1, there are two common ways in which primers are crimped. Most common is a circular ring crimp and the other is a staked crimp. The ring crimp is applied by a crimping die and the staked crimp is applied by "poking" the brass around the primer with two or three prongs that force the primer cup tightly around the primer.

larrymac1 · 12-20-2011, 07:43 AM

Is the ring a separate piece of metal that is pressed in at the same time as the primer? I am cleaning 2000 .223 brass and I have run into both types of crimps you mentioned. Before all I had seen was the ring crimp. The 3 punch must be something a bit older.

woolleyworm · 12-20-2011, 11:06 AM

Quote:

Originally Posted by larrymac1

Is the ring a separate piece of metal that is pressed in at the same time as the primer? I am cleaning 2000 .223 brass and I have run into both types of crimps you mentioned. Before all I had seen was the ring crimp. The 3 punch must be something a bit older.

The primer is already seated in the pocket and then the crimp is applied.

There is still modern ammo (mostly foreign) that has staked primers. I'll try to find some.

12-19-2011, 02:28 PM	#1
larrymac1 Member Join Date: Jul 2011 Location: Austin TX Posts: 4	How is military brass crimped? I can find tons of information about how to swage the pocket. I don't have a problem with that. I just got curious about how the crimp is placed in the casing to start with. Running 2000 .223 cases through the resizer just got me to thinking. I know why they do it, but just curious about HOW. -->

12-19-2011, 07:29 PM	#2
woolleyworm TFF Moderator/Host Join Date: Feb 2009 Location: SW Fort Worth Contributor Posts: 4,888	Re: How is military brass crimped? Welcome to TFF Larrymac1, there are two common ways in which primers are crimped. Most common is a circular ring crimp and the other is a staked crimp. The ring crimp is applied by a crimping die and the staked crimp is applied by "poking" the brass around the primer with two or three prongs that force the primer cup tightly around the primer. __________________ . What are you gonna do, talk the alien to death? -- (on Sigourney Weaver's worry about Guns in Aliens) "Safety is something that happens between your ears, not something you hold in your hands." "I carry a small gun to compensate for my huge Blue press." .

12-20-2011, 07:43 AM	#3
larrymac1 Member Join Date: Jul 2011 Location: Austin TX Posts: 4	Re: How is military brass crimped? Is the ring a separate piece of metal that is pressed in at the same time as the primer? I am cleaning 2000 .223 brass and I have run into both types of crimps you mentioned. Before all I had seen was the ring crimp. The 3 punch must be something a bit older.