Armory Sponsor
Posted: 12/2/2012 6:41:23 AM EDT
|
I got some once fired brass in the mail and I am trying to figure out who makes it. The case on the left has the military crimp and the one on the right doesn't.
http://i284.photobucket.com/albums/ll35/Raydee32/2012-12-02_09-20-20_730.jpg |
|
Ive loaded the crimps before without taking crimp out. Fired good. I use a lee hand primer, it primes them good but some times i need to spin the case around a little ro get the primer to seat.
So all in all, you can still hand prime cases with that crimp in it, just takes a few seconds longer. |
|
R - P stands for Reminton Peters. Remington had several "divisions" or differently named factories that produced their amunition. Some of it was marked UMC, for Union Metaillic Cartridge (company). Some of the .22 rimfire ammo is just marked U, again, for UMC.
The brass doesn't make the round/cartridge 5.56X45. The amount of powder, the weight of the bullet, how the bullet is seated in the case and the pressure produced when the round is fired makes it 5.56X45. |
|
Quoted:
R - P stands for Reminton Peters. Remington had several "divisions" or differently named factories that produced their amunition. Some of it was marked UMC, for Union Metaillic Cartridge (company). Some of the .22 rimfire ammo is just marked U, again, for UMC. The brass doesn't make the round/cartridge 5.56X45. The amount of powder, the weight of the bullet, how the bullet is seated in the case and the pressure produced when the round is fired makes it 5.56X45. I thought the true 5.56 had a thicker case which makes the internal dimensions tighter so when you load the same amount of powder as you would with a .223 case the pressure goes up? |
|
Quoted:
Quoted:
R - P stands for Reminton Peters. Remington had several "divisions" or differently named factories that produced their amunition. Some of it was marked UMC, for Union Metaillic Cartridge (company). Some of the .22 rimfire ammo is just marked U, again, for UMC. The brass doesn't make the round/cartridge 5.56X45. The amount of powder, the weight of the bullet, how the bullet is seated in the case and the pressure produced when the round is fired makes it 5.56X45. I thought the true 5.56 had a thicker case which makes the internal dimensions tighter so when you load the same amount of powder as you would with a .223 case the pressure goes up? Not true for 5.56. The 7.62 and 30-06 were known for this. IIRC Molon on this board did an excellent write-up on this subject that included case volume measurements to prove it out. Don't try to prime a case with the crimp intact. That will not go well no matter what has been posted above. 
|
|
Quoted:
Quoted:
Quoted:
The case on the right has been over-reamed, which could explain why there is no crimp. Fixed it for ya. Looks like a chamfer tool was used. Which also means it's not once fired. I have noticed that the R-P brass always has that look to it |
 My RP 223 cases I formed into 300 blk haven't been over reamed. These were once fired before being formed. Someone did that to those cases, and the cases never needed any reaming/swaging anyway. Reamer boy was wasting his time countersinking cases that had no primer crimp to start with.  Some more of "reamer boy's" work on the left. Far right cases that the crimp was removed with a Hornady reamer that has a positive stop. Also PP's were uniformed. |
|
All of the REM cases I have look the same like they have been reamed but they all look exactly the same and I am wondering if that is how they are from the factory? These cases are all supposed to be once fired but it is possible reloads snuck into the batch.
On the military cases I have been lightly reaming the crimp and now I am hoping that I am not reaming them to much. I have a Lee primer pocket cleaner and it doesn't fit into the shells that have the crimp so I have been lightly reaming them just enough to where the tool fits in to clean the pocket. I will post a picture later to day and see what you guys think. |
|
Quoted:
All of the REM cases I have look the same like they have been reamed but they all look exactly the same and I am wondering if that is how they are from the factory? These cases are all supposed to be once fired but it is possible reloads snuck into the batch. On the military cases I have been lightly reaming the crimp and now I am hoping that I am not reaming them to much. I have a Lee primer pocket cleaner and it doesn't fit into the shells that have the crimp so I have been lightly reaming them just enough to where the tool fits in to clean the pocket. I will post a picture later to day and see what you guys think. I think the commercial Rem brass does have a radius on the primer pocket. Usually mil-brass head stamp has manufacture and year and is crimped. More and more commercial ammo is being crimped but most have .223 on the head stamp. Cutting out the crimp with a reamer or chamfer tool is possible but swaging in my opinion is the best way. I still give them a light cut with a chamfer tool too. It helps give the primer a good lead-in. That Federal case with .223 AND year is kind of a new one for me. I have a good bit of Federal brass. I'm going to have to look at it again to see if I have any like that. |
|
Well it looks like I didn't ream mine enough. Might have to invest in a Dillon Super Swage or just re-ream them some more?
http://i284.photobucket.com/albums/ll35/Raydee32/2012-12-04_19-06-46_674.jpg |
Armory Sponsor