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7mm Magnum Sizing

 
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  #8  
Old 06-04-2013, 09:08 AM
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Re: 7mm Magnum Sizing

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Originally Posted by jimbires View Post
yes you should be resizing the whole neck , with the die adjusted this way . some guys still neck size only , I don't . I do have a few Lee collet dies , these only neck size , but then I also use a body die to push the shoulder back 0.002 . which is basically doing the same thing as using a full length die.
In measuring neck runout on resized cases using neck only as well as full length dies (both with die neck diameters .002" smaller than a loaded round's neck), the full length ones better center the neck on the case shoulder. The body's held well in place as the neck's sized all the way down setting the shoulder back a bit.

If the case neck's not centered on the shoulder on a case headspacing on its shoulder, both the neck and bullet will not be centered in the chamber throat.

I believe all of this is why most benchresters finally switched over to minimal full length sizing their fired cases.
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  #9  
Old 06-04-2013, 09:50 AM
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Join Date: Dec 2010
Location: Lake Tahoe, Calif.
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Re: 7mm Magnum Sizing

I've never heard of hacking off the body of a FL die but at least for non belted cartridges it seems like that's the way to go for neck sizing. You relieve the pressure of a growing shoulder by always bumping it back, you size the whole neck, but you leave the body alone.

So where do you cut the die- a few thousands past the shoulder? And how do you cut it precisely there?

Considering you're just pushing the shoulder back and there is no die past that part of the shell, do you ever get some kind of rippling below the shoulder?
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  #10  
Old 06-04-2013, 01:20 PM
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Re: 7mm Magnum Sizing

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Originally Posted by Shootin4fun View Post
So where do you cut the die- a few thousands past the shoulder? And how do you cut it precisely there?
I've cut a couple of 30 caliber belted magnum full length sizing dies off about 1/8" above the belt clearance groove and the same amount below the body-shoulder junction. After first using a standard full length sizing die on the belted cases setting the shoulder back a couple thousandths, I use this "body" die to resize the case body all the way back to the belt.

That gets rid of the ridge that usually appears a few thousandths above the belt and sizes the body down to about new case diameter. Except for the case now headspacing on its shoulder, it's at virtual new case dimensions. Sub 3/4 MOA accuracy at worst 1000 yards down range providing all the other stuff in the rifle's good and put together right.

Last edited by Bart B; 06-04-2013 at 02:55 PM.
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