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Neck Tension and the Crimp/No Crimp debate

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Re: Neck Tension and the Crimp/No Crimp debate

Postby ShootnMathews » Mon Apr 01, 2013 8:51 am

There was no real scientific way I came up with the 25lbs. I just kept increasing the poundage until I could see it begin to crimp the neck a little, then shot some to see how they shot. And they shot pretty well. I'm not sure how the force transfers through the cam mechanism on the press as far as possibly increasing or decreasing force, but I do know it you squeeze a factory crimp die in your hand it takes quite a bit of force to even move them.

My barrel is beginning to get copper fouled now but when it was clean I was getting .3 MOA pretty well. I've got about 100rounds down the pipe now and she's opening up to about .75. Going to give her a good cleaning in a couple days before shooting that 1000yard target. It'll be a few days or maybe a week or two before I'm healed up enough to shoot though.
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Re: Neck Tension and the Crimp/No Crimp debate

Postby DevilDog » Mon Apr 01, 2013 8:55 am

Yea, I was thinking that with all the mechanical translation from the arm, to the ram, to the prongs in the crimper that the pressure would be something different.

As long as it is consistent, though and that is the beauty of using the torque wrench. On a .311 bullet, the pressure would swage the bullet some, I have seen that in pulled bullets from loads I "undid".

So there is room for variance in just using the handle, I have thought that myself while crimping in the past, "Am I getting the same pressure each time?"

With my .308 set up, the forks will not close far enough for much of a crimp, so additional pressure does not yield a firmer crimp.
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Re: Neck Tension and the Crimp/No Crimp debate

Postby ShootnMathews » Mon Apr 01, 2013 9:04 am

DevilDog wrote:Yea, I was thinking that with all the mechanical translation from the arm, to the ram, to the prongs in the crimper that the pressure would be something different.

As long as it is consistent, though and that is the beauty of using the torque wrench. On a .311 bullet, the pressure would swage the bullet some, I have seen that in pulled bullets from loads I "undid".

So there is room for variance in just using the handle, I have thought that myself while crimping in the past, "Am I getting the same pressure each time?"

With my .308 set up, the forks will not close far enough for much of a crimp, so additional pressure does not yield a firmer crimp.



I'm sure that when the force reaches the crimp die that is is not 25lbs. Don't really know if it is more or less but it seems to put the right amount of crimp on the bullets for me. Does not deform or swage the bullet and seems to uniform the pressure pretty well.
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Re: Neck Tension and the Crimp/No Crimp debate

Postby Marauder 1 » Mon Apr 01, 2013 9:21 am

  On a .311 bullet, the pressure would swage the bullet some, I have seen that in pulled bullets from loads I "undid".  

Homemade Cannelures!

I started to think "maybe you could use a British .303 crimp on .311" but there are some differences that may not make it possible.

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Re: Neck Tension and the Crimp/No Crimp debate

Postby Shepard » Mon Apr 01, 2013 10:14 am

http://www.titanreloading.com/consistent-crimp

This is where I got the idea to use a torque wrench to crimp the casings.
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Re: Neck Tension and the Crimp/No Crimp debate

Postby ShootnMathews » Mon Apr 01, 2013 10:54 am

Shepard wrote:http://www.titanreloading.com/consistent-crimp

This is where I got the idea to use a torque wrench to crimp the casings.


Same here my friend. Works like a charm. saw it on youtube and took a look at my press. When I saw the bolt head there on the side it was a no-brainer.
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Re: Neck Tension and the Crimp/No Crimp debate

Postby farmerboy78 » Tue Apr 02, 2013 5:13 pm

That is an awesome concept that I bet works well, will have to see if I can do this with my rockchucker press
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