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Author Topic: Tight case necks and large shoulders  (Read 510 times)

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Offline corbanzo

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Tight case necks and large shoulders
« on: September 08, 2008, 08:06:36 AM »
So it turns out when you take a big case, and put a small neck on there, the shoulder becomes a little larger than it might should be.  Case in point, the 7mm RUM.

[img width= height=]http://i72.photobucket.com/albums/i193/corbanzo/IMG_1831.jpg[/img]

Thought it was a fluke at first, but then it happened again....  So I took all the cases that I had just chamfered and chamfered the living @#$^ out of them, no more problems.   
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Offline Lone Star

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Re: Tight case necks and large shoulders
« Reply #1 on: September 08, 2008, 09:14:52 AM »
Telescoped necks are a pain.  Another thing to do to reduce their occurrence is to polish the inside of the case necks with a brass brush in an electric drill.  That and camfering helps a lot.


.
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Offline stimpylu32

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Re: Tight case necks and large shoulders
« Reply #2 on: September 08, 2008, 12:25:48 PM »
Not quite what Akley had in mind , me thinks   ;D

Give the brush in the neck a try , it will do wonders , some powdered graphite in the neck will help too .

stimpy
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:D If i can,t stop it with 6 it can,t be stopped

Offline huntswithdogs

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Re: Tight case necks and large shoulders
« Reply #3 on: September 09, 2008, 05:00:43 AM »
One of the reasons I went to using OneShot. Lube stays in the neck and assists with seating.


Reckon a man could reform those cases by firing them?

 JUST KIDDING!!!!!!!!!

Pull the bullets, dump the powder and toss them cases!


HWD
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Offline stimpylu32

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Re: Tight case necks and large shoulders
« Reply #4 on: September 09, 2008, 02:42:52 PM »
corbanzo

Something you may try is to get a slim profile chamfer tool , I think it has a 15* cut as apposed to the 30* of most cutters , it was designed to help seating of for the longer VFD bullets .

I beleave it is Lyman that makes it but don't Quote me on that .

stimpy
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:D If i can,t stop it with 6 it can,t be stopped

Offline corbanzo

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Re: Tight case necks and large shoulders
« Reply #5 on: September 10, 2008, 08:00:01 AM »
That is actually exactly what I did.  At first I had used my RCBS, which has the 30 degree or so angle, then I switched to my other chamfer tool, which has much less of a slope.  Did the trick.  I would rather not throw anything that resembles lubrication in these case necks...  maybe in something without quite so much recoil. 
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Offline Catfish

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Re: Tight case necks and large shoulders
« Reply #6 on: September 10, 2008, 10:56:05 AM »
You can dip the cases into mica also helps. I use # 12 shot with mica in it for neck sizeing, it will not contaminate the powder.
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