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Rookie needs help...bullet wont stay in neck

 
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  #1  
Old 09-20-2013, 11:41 PM
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Join Date: Jul 2010
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Rookie needs help...bullet wont stay in neck

I am not a total rookie, I have been loading 300wsm and 270 for about a year. I just started 7mm Remington Magnum.

I am using once fired brass, redding type s competition dies. The die is a full length sizing die. When seating the bullet, I can push it by hand further into the case. I followed the hornady book and it notes the outside neck diameter of .315 and mine after sizing are .315 to .316. I have tried adjusting the die but it makes no change in neck. I also have some winchester fresh brass and it measures .308 to .310 on the outside neck.

I am sure it a simple answer so be gentle!

N
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Old 09-21-2013, 12:05 AM
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Join Date: Dec 2012
Posts: 12
Re: Rookie needs help...bullet wont stay in neck

Just a couple of thoughts. Have you checked a sized case to see if it will chamber? Reason for asking is to make sure the case is getting fully sized. If it is, I would check the size of your neck expander button. The expander on my Redding 7MM Rem Mag dies measures .282. I admit that I am not familar with Redding competition dies.
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Old 09-21-2013, 12:32 AM
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Re: Rookie needs help...bullet wont stay in neck

Expander is .282 and the sized casings do chamber, snug.
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Old 09-21-2013, 03:18 AM
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Re: Rookie needs help...bullet wont stay in neck

What is the od of a loaded round? Your bushing should be about .002" smaller than that.
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Old 09-21-2013, 03:28 AM
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Re: Rookie needs help...bullet wont stay in neck

With the very little information supplied it sounds like you are not fully sizing the cases. Usually the main reason for little to no neck tension is the neck isn't resized.
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  #6  
Old 09-21-2013, 04:04 AM
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Re: Rookie needs help...bullet wont stay in neck

Quote:
Originally Posted by RemingtonShooter View Post
I am using once fired brass, redding type s competition dies.N
Are the brass once fired in the same rifle. If so why would you want to full length size again. Use a neck sizer die only with bushings to attain the correct neck tension.
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  #7  
Old 09-21-2013, 05:38 AM
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Re: Rookie needs help...bullet wont stay in neck

Use calipers to measure the outside diameter of the neck of a loaded round then buy a bushing .002" smaller than your measurement. That will give you the proper neck tension.
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