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Neck turning and Blown primers

 
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  #1  
Old 05-02-2014, 04:20 PM
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Location: East Texas
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Neck turning and Blown primers

So I have a .260 rem. I've been shooting Precision matches with.
My load was a 140 Berger over 41.4 grains of H4350 with a COL of 2.850
I was having some chamber a little tight and decided to turn the necks. Took of a thou.
Not even 100% clean up on the neck.
Loaded some up using same old formula. Blew 3 out of 4 primers.

Was not expecting that!

BTW. Book on that load is 41.2 in berger manual
@ 2.830
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  #2  
Old 05-02-2014, 04:36 PM
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Re: Neck turning and Blown primers

Guess I should state that I had worked up to the load prior to turning.. And a little past it, but it shot best. It had over 100 rounds through it with no issues.
I also double checked my scales and they are still spot on. So that wasn't the issue.

Just a little shocked that shaving a hair off the neck caused such a pressure jump.
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An unarmed man can only flee from Evil and Evil is not overcome by fleeing it.

The proper use of a Pistol is to fight your way back to where you left your Rifle.

The best gun to have? ... The one in your hand when the fight starts!

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  #3  
Old 05-02-2014, 05:47 PM
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Re: Neck turning and Blown primers

Turned necks do not cause higher pressures.
Be sure your headspace is not excessive and that your trim length allows clearance from chamber end (headspace included).
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  #4  
Old 05-02-2014, 07:21 PM
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Re: Neck turning and Blown primers

Your problem IS NOT turned necks!

1. Excess headspace? is it hard chambering?

2. Changed lots of powder?

3. Are you NS only? If so, forget it and get a body die or FL die and learn how to set it up to just push the shoulder back no more than .002
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  #5  
Old 05-03-2014, 07:01 AM
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Re: Neck turning and Blown primers

Check for donuts on the inside of the case where the shoulder meets the neck. After firing a case, insert a bullet in the neck. If it get stuck you have a donut and will have to cut it out with a reamer (Foster). Then it cauld also be that the cases had harderned - do you anneal them after 4 reloads or so?

Then check the diametre of the primers you are using compared to the one's you used before. I use a very old batch of Winchesters LR and Magtec LR since they are a few thousands larger in diametre and therefour would give you a proper seal. It could also be that the primer pocket had stretched after several firings. Then you need to adjust the primer to those cases.
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  #6  
Old 05-03-2014, 07:03 AM
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Re: Neck turning and Blown primers

Check your case length as well.
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  #7  
Old 05-03-2014, 10:24 AM
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Join Date: Sep 2011
Location: East Texas
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Re: Neck turning and Blown primers

Trim length has not changed. Head space has not been an issue for the last 379 rounds down the tube and nothing about my case prep changed other than the OD neck turning and ID reaming.
These cases are once fired Fed. Gold medal match that I FL resized. ( I know They are not the most desire able cases but I have a healthy supply issued to me). I have probably spent more time and tooling money on these cases than if I had bought Rem. Or Win.
I did have to pop open a new case of primers and another can of powder at this juncture. I'm running Win. LR primers.


I have never seen enough fluctuation between Lots before for that to have been my first conclusion. But that is where I will look now.
__________________
An unarmed man can only flee from Evil and Evil is not overcome by fleeing it.

The proper use of a Pistol is to fight your way back to where you left your Rifle.

The best gun to have? ... The one in your hand when the fight starts!

Respect All - Fear None
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