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Old January 28, 2012, 09:06 PM   #1
tpcollins
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Who uses seater dies with crimp option?

Some of the Hornady and Dillion bullet seating dies have an optional crimp feature, my Lee collet dies don't and I don't think RCBS does either. I was thinking of getting a Hornady seating die in .204 Ruger just to see what the difference is for crimping versus not crimping.

Just wondering if anyone has ant thoughts one way or the other? Thanks.
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Old January 28, 2012, 09:09 PM   #2
mrawesome22
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All seating dies have the ability to crimp.

The collet die is a neck size die, not a seater die.
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Old January 28, 2012, 09:19 PM   #3
tpcollins
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My Lee collet die set comes with a bullet seating die. That seating die will not crimp, it just seats the bullet.

My question still is: what's the difference bewteen crimped versus not crimped?
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Old January 28, 2012, 09:23 PM   #4
Brian Pfleuger
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The crimp holds the bullet in place for a bit longer while pressure builds. I've heard that some powders get more consistent ignition if you use a crimp.

It can also be necessary in some semi-autos and lever actions to prevent bullet setback on feeding.

I load only for single shots and bolt actions. I have never crimped any of them and I know most people don't. The only way to know if it helps or hurts you is to try it.
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Old January 28, 2012, 09:29 PM   #5
mrawesome22
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The forum search function works great.

Try keywords like "crimp", "advantage crimp".

Lots and lots of info.

Or you could go old school and read your manual.
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Old January 28, 2012, 09:54 PM   #6
PA-Joe
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You can also buy a Lee factory crimp die.
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Old January 29, 2012, 09:53 AM   #7
FatWhiteMan
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I do not crimp most of my rifle loads. I do use a roll crimp with the seating die on my .223, 7.62x39 and 45Colt. I use a separate taper crimp die on .40S&W and .45ACP.

Most reloading manuals will explain the difference.
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Old January 29, 2012, 10:07 AM   #8
GlenF
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I have some Dillon die sets, and none of bullet seating dies are able to crimp.

What am I missing?
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Old January 29, 2012, 11:31 AM   #9
243winxb
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seating die in .204 Ruger

Quote:
seating die in .204 Ruger
The die will seat and roll crimp at the same time. Brass must be all the same length or a bulge in the neck or shoulder will form, if over done. Bullet needs a cannelure. RCBS die has a crimper. You Lee die does not. A crimp is not needed with correct neck tension. But a crimp may help keep the bullet from being set back on loading in an auto if bullet hits the feed ramp. Plus it may help keeps the bullet from moving forward in an auto on chambering. Neck tension is still #1

Last edited by 243winxb; January 29, 2012 at 11:54 AM.
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Old January 29, 2012, 11:40 AM   #10
243winxb
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Quote:
I have some Dillon die sets, and none of bullet seating dies are able to crimp.

What am I missing?
From Dillons website> Dillon Three-Die Rifle Die Sets include a sizing/ depriming die, a bullet seating die and a taper crimp die. Dillon Two-Die Rifle Die Sets include a sizing/depriming die and a seat/crimp die.

Dillon is selling Redding Dies now.

Last edited by 243winxb; January 29, 2012 at 11:50 AM.
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