Taper or roll crimp in 9mm

[Sharps '63]

Years ago, I used to roll crimp for my 9mm Brownings with lead bullets.

Now my wife has a Ruger SR9 and we've decided to load for it with a commercial hard cast 130 gr RNFP we always have on hand fro her Marlin carbine. This bullet has a crimping groove.

Since my 9mm experience is long since past, any comments, suggestions .... ?

 

[Tex Critter]

A true roll crimp is not desireable for cartridges that headspace on the mouth because the cartridge can potentially be pushed beyond the chamber into the forcing cone. A taper crimp will prevent this. My Lee dies use a modified taper/roll crimp but I still lightly crimp for lead bullets.

 

[slicknova]

I use a slight taper crimp, The 9mm headspaces off the case mouth so roll crimping could cause headspace issues.

 

[graydog]

Yes as others have stated you should be taper crimping 9mm rounds and not roll crimping.

Graydog

 

[Ganderite]

The 9mm seating die will have a taper crimp in it.

 

[tallguy992]

Light taper crimp is all that is required.

 

[Sharps '63]

Most of my other dies are Dillon. I'll stick with them.

Hopefully, a taper crimp at the crimping groove will be effective.

 

[tjhaile]

How does one roll crimp 9mm? As far as I know, all 9mm die sets are made for taper crimping.

Taper crimping at the crimp groove should work fine, assuming the loaded round fits the chamber. I have done the same thing with 200 grain RNFPs intended for .45 Colt in .45 ACP.

 

[Sharps '63]

Now that you mention it, I do the same thing with .45 200 gr RNFPs to feed my 1911s.

Back in the era I was referring to, 9mm dies were roll crimp. You had to order a taper crimp die as an extra. Same for .45 ACP. Taper crimping came as a quantum leap forward, as did carbide resizing dies.

 

[The Breeze]

Back in the era I was referring to, 9mm dies were roll crimp. You had to order a taper crimp die as an extra. Same for .45 ACP. Taper crimping came as a quantum leap forward, as did carbide resizing dies.

Rimless cartridge dies have NEVER been roll crimp by 'default'.

 

[shredder]

A slight taper crimp, just enough to push the flared case back against the bullet, will be enough.

That's all I do and my SR9 feeds and chambers it very well.

 

[Tex Critter]

Rimless cartridge dies have NEVER been roll crimp by 'default'.

From the Lee Web site:

Taper crimp die offers little or no advantage when used with 1986 or newer Lee Dies as the crimp angle is already a modified taper crimp

 

[BigUglyMan]

I was going to say "Taper" as well.