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300 rum neck sized brass wont chamber

 
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  #1  
Old 02-08-2013, 12:15 PM
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Join Date: Jan 2011
Location: NORTH EASTERN NEVADA
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300 rum neck sized brass wont chamber

I figured i would try neck sizing instead of FL sizing, what i have found is the brass will chamber but it is semi tight closing the bolt and hard to eject and it leaves markes on the lower part of the brass, this is in a sendero, could it be it has a tight chamber and i need to FL size every time, also i am shooting 208 amax. 215 primer and 94 gr retumbo Thank you
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  #2  
Old 02-08-2013, 12:39 PM
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Re: 300 rum neck sized brass wont chamber

new brass?
old brass?
once fired?
over sizing neck, hitting shoulder?
trimmed brass?
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  #3  
Old 02-08-2013, 12:49 PM
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Re: 300 rum neck sized brass wont chamber

Quote:
Originally Posted by MTBULLET View Post
new brass?
old brass?
once fired?
over sizing neck, hitting shoulder?
trimmed brass?
tried once fired after full length resizing and new and trimmed and old and like i said before it is leaving marks at the base of the brass where it is tight, i even tried after the fourth and fifth reload, does not make a difference, rcbs die set to where the shell holder just touches the bottom of the die, brass goes smooth into the die just doesnt like to go into the gun, i neck size for other calibers with no problems, just seems that way with this sendero.
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  #4  
Old 02-08-2013, 12:53 PM
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Re: 300 rum neck sized brass wont chamber

does just fired, non-resized brass chamber ok?
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  #5  
Old 02-08-2013, 01:36 PM
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Re: 300 rum neck sized brass wont chamber

Shoulder needs bumped back .003
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  #6  
Old 02-08-2013, 02:46 PM
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Re: 300 rum neck sized brass wont chamber

Quote:
Originally Posted by MTBULLET View Post
does just fired, non-resized brass chamber ok?
yes it does i just checked, Im not sure how to bump the shoulder back.
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  #7  
Old 02-08-2013, 03:03 PM
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Re: 300 rum neck sized brass wont chamber

Use a full length die and turn 1/4 turn at a time untill you get close to .003 then turn 1/8 turn until you are there. Don't freak out your brass will grow before it starts bumping the shoulder back. I used to neck size everything but not no more I shoulder bump everything; I can tell no differense in acuracy from neck sizing.
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