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9mm and crimping

This is a discussion on 9mm and crimping within the Reloading forums, part of the Firearm Forum category; I just ordered an SR9 and will be relaoding the 9mm. I currently load .38spl/.357mag and .44spls for revolvers with Lee Dies and use a ...


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Old December 17th, 2011, 07:52 PM   #1
 
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9mm and crimping

I just ordered an SR9 and will be relaoding the 9mm. I currently load .38spl/.357mag and .44spls for revolvers with Lee Dies and use a Lee Factory Crimp Die. I know that loading for semi autos is different when it comes to crimping. I will be using Lee Dies with a Hornady New Dimension Seating Die for the 9mm. I know I need a light taper crimp for the 9mm from what I have read. Should I purchase and use the Lee Factory Crimp Die for 9mm? Any tips would be greatly appreciated.




Last edited by cmann; December 17th, 2011 at 07:58 PM.
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Old December 17th, 2011, 07:56 PM   #2
 
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I crimp 9mm just enough to take the bell out and have no issues in any of my semi autos.I use the Lee fcd and would say it does a great job.

Last edited by Samuel; December 17th, 2011 at 07:59 PM.
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Old December 17th, 2011, 08:17 PM   #3
 
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9mm is a straight walled case. Just crimp enough to remove the bell you made to seat the bullet with. The top of the case should be the same diameter as the case at the bottom of the seated bullet.
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Old December 17th, 2011, 08:21 PM   #4
 
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and will the bullet seater do this automatically when i seat a bullet if I set it for a crimp? Or do i use a separate crimp die like the Lee?
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Old December 17th, 2011, 08:23 PM   #5
 
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Same operation as seating the bullet is fine. My bullet seating die is set to just remove the bell. You have to remember that the 9mm locates off the bullet side of the case, not the primer side, so you don't want to "crimp" just remove the flair. Use your barrel as a guage.
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Old December 17th, 2011, 09:14 PM   #6
 
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There's a .011" taper on the 9 mm para case
.28 millimeters = 0.011023622 inches
I use a taper crimp or lee factory criimp

Last edited by gunnysmith; December 18th, 2011 at 06:50 AM. Reason: late night math problem:)
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Old December 17th, 2011, 11:40 PM   #7
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I used to just let the bullet seating operation in my Hornady dies take care of the very slight case mouth expansion. Now I have a Lee FCD for 9mm. Just a slight bullet recession in the 9mmP can greatly increase pressures.

Go with the Lee taper FCD.
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Old December 18th, 2011, 05:10 AM   #8
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The 9mm isnt really a "straight" walled case. Roll one on a desktop to confirm. If it is sized as a straight-walled case, it will malfunction. A typical ring or donut shaped sizing ring would not work and a tapered sleeve would be required to achieve a tapered case sizing or tapered crimp operation. Check your die to see the difference.

Last edited by MidLife; December 18th, 2011 at 05:37 AM.
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Old December 18th, 2011, 05:29 AM   #9
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Quote:
Originally Posted by NAASilent View Post
9mm is a straight walled case. Just crimp enough to remove the bell you made to seat the bullet with. The top of the case should be the same diameter as the case at the bottom of the seated bullet.
Actually 9mm cases have a slight taper. It should measure .391 at the base and .380 at the mouth which makes for a .011 taper.

Last edited by TMD; December 18th, 2011 at 05:34 AM.
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Old December 18th, 2011, 06:08 AM   #10
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I've used my Lee Factory Crimp Die on some and just used the adjustment on the Lee Seating Die on some and can't tell a heck of a lot of difference.

IMO the seating die puts adequate crimp on the 9mm. I've shot thousands that way without problems. Not sure if the Hornady functions the same.

Last edited by JimB120; December 18th, 2011 at 06:11 AM.
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Old December 18th, 2011, 06:33 AM   #11
 
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Quote:
Originally Posted by TMD View Post
Actually 9mm cases have a slight taper. It should measure .391 at the base and .380 at the mouth which makes for a .011 taper.
I can definitely agree with this.I honestly had not measured my crimp in a long time due to not having any issues but I just checked about 7 different rounds of mine and your measurements are almost dead on with how my 9mm reloads turn out.
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Old December 18th, 2011, 01:51 PM   #12
 
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Quote:
Originally Posted by cmann View Post
I just ordered an SR9 and will be relaoding the 9mm. I currently load .38spl/.357mag and .44spls for revolvers with Lee Dies and use a Lee Factory Crimp Die. I know that loading for semi autos is different when it comes to crimping. I will be using Lee Dies with a Hornady New Dimension Seating Die for the 9mm. I know I need a light taper crimp for the 9mm from what I have read. Should I purchase and use the Lee Factory Crimp Die for 9mm? Any tips would be greatly appreciated.
I use a Redding taper crimp die instead of the Lee FCD with my Lee 9mm dies. Yes, a light taper crimp is all you need.
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Old December 23rd, 2011, 10:24 AM   #13
 
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I use the RCBS and it "crimps" while seating the bullet.
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Old December 23rd, 2011, 10:37 AM   #14
 
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You can crimp (remove the flare/bell) with the seating die.
You can also adjust your seating die so it doesn't touch that area and use the Lee FCD.

Either way works; find what works for you.
Either way, only a very light crimp to no crimp is needed on the 9mm Luger.

If you find your crimps are inconsistent, check case lengths and sort/trim/adjust die as needed.
I've found quite a difference between manufacturers and that will affect your crimp.

Also make sure your resizing die is adjusted correctly so the case is fully resized.
Being a tapered case that makes a difference on neck tension whereas on the .38/.357 it does not.
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Old December 23rd, 2011, 02:49 PM   #15
 
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Does the 9mm LFC Die automatically do a tapered type of crimp? If adjusted correctly? I use the LFC die on my other callibers so i am familiar with the die but I am not sure if it is different for the 9mm.
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