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Old July 15, 2012, 08:35 AM   #1
steve4102
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Range Report Lee FCD.

There has been a few threads on here lately about the use of the Lee Factory Crimp die and how it affects accuracy. I tested the LFCD for accuracy quite some time ago and in my tests accuracy was improved. I have used it ever since on all of my semi-autos.

After reading through all the comments and posts on how the LFCD degraded accuracy I started to second guess myself and my previous testing, maybe I'm not getting the improved accuracy I thought I was.

I decided it was time double check my loads and see if crimp was actually helping or hurting.

Certainly none of this is scientific and probably not be enough of a sample to declare a winner or a looser, but it's what I got.

The rifle used was my Colt HBAR, 5.56. I used new never fired Lake city brass for this test as I thought it might be more consistent than my lot of several times fired LC brass.

This first target is Sierra 53gr HP MatchKing, 25.5gr AA 2520. The heavy crimp is "heavy" it put a deep cannulure in the bullet similar to some pictures that have been posted here in the past. The Med Light crimp was visible on a bullet bullet, but barely.



This load is 53gr Sierra with 26gr of 748. I fired five rounds at the "crimp" target first, then five at the "No-crimp" target



Same load, this time I fired five "no-crimp" first.



Same load, again I fired "no-crimp" first


That's all I got for now, you can draw your own conclusions, or not.

Last edited by steve4102; July 16, 2012 at 04:56 PM.
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Old July 15, 2012, 08:43 AM   #2
Brian Pfleuger
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Nice test!

Why didn't you shoot that fly?

Where's our group measurements so we don't have to guess?

Use OnTarget to measure your groups, it has an interesting learning curve but it works great.

http://www.ontargetshooting.com/download.html
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Old July 15, 2012, 09:14 AM   #3
steve4102
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Thanks, I have On-Target, i'll give it a try.
Until then the red squares measure 1 inch and the black dot 1/2 inch.

The round targets the white center measures 1 inch and the yellow measures 2 inches.
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Old July 15, 2012, 10:57 AM   #4
FiveInADime
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I don't know your procedure, but I would shoot one crimped at one target and then one un-crimped at the other target and alternate back and forth until you're done. I will spread the fouling and barrel heat evenly between the groups.
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Old July 15, 2012, 11:33 AM   #5
steve4102
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My procedure as posted above was,
Fire 5 with crimp then five without. Fire five without the crimp then five with, fire 5 without the crimp then five with.
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Old July 15, 2012, 11:49 AM   #6
mrawesome22
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What was es and sd like for the crimped vs non-crimped?

Sent from HenseMod6.
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Old July 15, 2012, 01:26 PM   #7
the led farmer
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ya brother, work the degree of the crimp die until you get it right, just like you would work up oal, or powder charge, or headstamp or any of the other variables.

you already found you don't have to deform the entire cartridge to get results, a little goes along way.

the lfcd works, if you work with it. dial in that sucker
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Old July 15, 2012, 01:31 PM   #8
jmortimer
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The Lee rifle FCD can produce better results if you are will to put in the time and effort. For me I like a light crimp and don't sweat the results as long as the gun is MOA-Bad Guy.
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Old July 15, 2012, 03:39 PM   #9
steve4102
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Quote:
What was es and sd like for the crimped vs non-crimped?
Duno, did not run these over the Chrony.
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