9mm luger taper crimp

[jamcam1999]

Just wondering if anyone has done the same as I have and what the results were. I have loaded and seated the bullets in 9mm luger cases and not having a taper crimp die, I ran the cases through the carbide sizing die, (not screwed all the way down) just to eliminate the expanded portion at the top of the case where the bullet sits. Seems to work ok, no problems with feeding and firing in my Norinco 9mm. Did not seem to affect accuracy or pressure. Would be interesting to find out if anyone else tried this. I eagerly await your response.

 

[Shooter ----/]

My seating die also crimps if set properly.

 

[Wolf@TS]

^^ Lee seating / crimping die has worked for me as well ^^

 

[Ganderite]

Yes, I have done something like that, but are you sure you don't have a taper crimper? It is usually a built in feature of the seater die.

Unscrew the seater stem, and then push a loaded round up all the way and then screw the die body down until it hits the loaded case. That is the crimper. Drop the case and turn the die in a quarter turn and lock it into place. That will be about the correct crimp position. Then push the loaded round back up and screw in the seater until it hits the bullet, so the seater is back into the correct position.

 

[dogzilla]

On most autoloading cartridges the taper crimp is built in, just as the roll crimp is in revolver cartridge dies

 

[RojamB21]

Yes, I have done something like that, but are you sure you don't have a taper crimper? It is usually a built in feature of the seater die.

Unscrew the seater stem, and then push a loaded round up all the way and then screw the die body down until it hits the loaded case. That is the crimper. Drop the case and turn the die in a quarter turn and lock it into place. That will be about the correct crimp position. Then push the loaded round back up and screw in the seater until it hits the bullet, so the seater is back into the correct position.

You are right on money but 9mm has the ( head space, head edge, head cover - whatever the hell is called. It's too morning without coffee) So I keep them without some sort of crimp. I keep the mouth like the finger nail edge . Don't over do it .

 

[silverfoxdj]

tagged

 

[madcow]

A roll crimp actually pushes the edge of the casing into the bullet, holding it in place. This is usually needed on high power revolvers to keep the bullet from being moved by recoil and keeping a revolver from indexing.

A taper crimp "tapers" the casing, holding the bullet in place, not as strong a hold on the bullet, but some cartridges headspace on the end of the casing so you cant roll crimp it, which would shorten the cartridge. More for pistols.

Seater dies usually have a roll crimp, taper crimps are a die on their own in my die sets (4 die sets)

 

[dogzilla]

Depends on the cartridge. Cartridges normally used for revolvers, 38spl,45lc,44mag, etc., come with a roll crimp. Cartridges for auto's come with a built in taper crimp, (9mm, 45acp). For most die makers, a separate die isn't necessary. I use RCBS, and have never used a separate die in 35yrs

 

[jamcam1999]

My dies are Lyman, older, and the crimp that they put on the cases is a roll crimp, not taper. I have been advised against roll crimping on 9mm luger because this cartridge headspaces on the rim and roll crimping negates this to some degree.
Thanks to all who responded. Your comments are much appreciated.

 

[ted_dent]

My dies are Lyman, older, and the crimp that they put on the cases is a roll crimp, not taper. I have been advised against roll crimping on 9mm luger because this cartridge headspaces on the rim and roll crimping negates this to some degree.
Thanks to all who responded. Your comments are much appreciated.

If you adjust the roll crimp die so that it just starts to remove the belling of the case mouth from the expander die it will work without causing any headspace issues. The problem is that because almost no one (including me) bothers to trim handgun cases to uniform length the longer ones conceivably could end up with a fair bit of roll crimp and therefore headspace problems while the short ones might not have the expander 'belling' completely removed resulting in chambering problems. It will generally work in a pinch but if I were you I would definitely invest in a taper crimp die or, even better, a Lee factory crimp die.