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Do I need to neck turn?

 
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  #1  
Old 03-18-2013, 05:31 PM
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Do I need to neck turn?

7mmSAUM, shooting necked down norma 300 SAUM brass
Reamer neck diameter 0.321
Loaded case neck diameter 0.316
Full lenght sized unloaded case 0.314
Fired case diameter 0.319
redding standard fell length sizer was the die I used

Reason I ask is I loaded up some ammo off of Berger reloading manual. used their 168 VLD to start with but was shooting 162 hornday match bullets so I figured it would be fine but was showing some pretty good amounts of pressure. fired 2 rounds and stopped there.

Load was 56 gr. of 4831sc at 3.060" OAL
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  #2  
Old 03-18-2013, 06:00 PM
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Re: Do I need to neck turn?

Hodgdon shows your charge as start charge for the hornady 162 in the 7 saum. Are you on the lands or are you giving it a bit of a run??
5 thou clearance should be fine. You aren't that tight as the fired diameter is also a few thou. above loaded diameter.
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  #3  
Old 03-18-2013, 06:03 PM
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Re: Do I need to neck turn?

They are about 10 thou off the lands. Another thing i am used to is with a fired case i have been told a bullet of the same cal should slide in easily. I think I could literally punch out the primer put in a new primer add powder and seat a bullet.
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  #4  
Old 03-18-2013, 06:17 PM
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Re: Do I need to neck turn?

Quote:
Originally Posted by ZSteinle View Post
They are about 10 thou off the lands. Another thing i am used to is with a fired case i have been told a bullet of the same cal should slide in easily. I think I could literally punch out the primer put in a new primer add powder and seat a bullet.
If you are tight enough that you can't put another pill in of the same cal. you may want to turn a bit. It seemed from your measurements you had a bit of breathing room. Think about backing the bullet up a bit too at least to start with. Giving it a bit of run will ease pressure some.
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  #5  
Old 03-18-2013, 06:38 PM
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Re: Do I need to neck turn?

Just tried again to put a bullet back in the case and I can seat a bullet with some force and pull it back out by hand. Seems like trimming of 0.001 would help but dont really want to do it unless necessary. I will start with a lower load and start to work up and see what it does first.
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  #6  
Old 03-19-2013, 06:18 AM
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Re: Do I need to neck turn?

Bullets should be held tight enough to not easily be pulled out by hand. It doesn't matter accuracy wise how much clearance there is between the case neck and chamber neck. The neck centers perfectly in the chamber when it's fired anyway, regardless of the clearance amount.
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  #7  
Old 03-19-2013, 06:43 AM
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Re: Do I need to neck turn?

Quote:
Originally Posted by Bart B View Post
Bullets should be held tight enough to not easily be pulled out by hand. It doesn't matter accuracy wise how much clearance there is between the case neck and chamber neck. The neck centers perfectly in the chamber when it's fired anyway, regardless of the clearance amount.
Bart, he's talking about fired rounds not accepting another bullet easily(on a fired brass without re-sizing); ie. he's not getting a good release.

What is your brass's trim LENGTH in relation to your chamber dimension?? I'm starting to wonder if you aren't at the end of the chamber and dang near crimping the brass into the pill when you chamber.

"Loaded case neck diameter 0.316
Full lenght sized unloaded case 0.314
Fired case diameter 0.319"

From your loaded diameter to your fired diameter there's .003" expansion; that should be sufficient.
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