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question on tight neck chambers

 
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  #1  
Old 04-12-2006, 09:55 PM
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question on tight neck chambers

on a 6mmbr .262 neck what would the neck measurement be of the loaded round? and what redding neck size bushing would be needed to resize it ? thanks,Brian
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Old 04-13-2006, 04:31 AM
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Re: question on tight neck chambers

Brian, depending on your rifles performance, I think .0085" neck wall thickness will do. That will give you .002" neck clearance. You should get a .256 and a .257 bushing. That being said, my PPC rifles with .262 necks, have always done better with .009" neck walls, sized with .258 buttons.
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Old 04-13-2006, 06:08 AM
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Re: question on tight neck chambers

[ QUOTE ]
Brian, depending on your rifles performance, I think .0085" neck wall thickness will do. That will give you .002" neck clearance. You should get a .256 and a .257 bushing. That being said, my PPC rifles with .262 necks, have always done better with .009" neck walls, sized with .258 buttons.

[/ QUOTE ]

i have read some where that for a bolt action rifle you want .002-.004 neck tension is this the same thing only .009 ? thanks for your help ,Brian
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Old 04-13-2006, 06:25 AM
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Re: question on tight neck chambers

Folks using tight chamber necks typically like their loaded round neck diameter to be between .001 to .003-inch smaller than the chamber neck diameter. It depends on what they get best accuracy with.

Interesting thing is that many people get equal accuracy with normal chamber neck diameters and loaded round neck diameter being .004- to .006-inch smaller.

Whatever the diameter of your loaded round neck diameter is, use a die .001- to .002-inch smaller. This depends on how much tension your want on the bullet and how much elasticity the brass has to spring back.
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Old 04-13-2006, 07:15 AM
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Re: question on tight neck chambers

[ QUOTE ]
i have read some where that for a bolt action rifle you want .002-.004 neck tension is this the same thing only .009 ? thanks for your help ,Brian

[/ QUOTE ]

NO - The .009" reference is the neck wall thickness, presumably after neck turning. The .002-.004" is a reference to how much smaller the neck diameter is (after sizing) compared to what it will be when the bullet is seated. This measurement is often called " neck tension".

Generally speaking, with a .262" neck you would want (aprox) a loaded round neck diameter of .260", thus leaving .002" of neck clearance for bullet release. To get a loaded round neck diameter of .260" you must subtract the actual bullet diameter of .243", which leaves .017" for the brass tubing itself. Since the neck is on each side of the bullet you divide the .017" by 2. This will give you .0085" for the neck wall thickness.

Last consideration - When determining the proper bushing for sizing you merely determine what your loaded round neck diameter will be and subtract (aprox) .003". This allows for .001" "spring-back" of the brass and leaves .002" neck tension.

Bottom line for someone new to tight neck chambers:: Make certain of you chamber neck diameter before begining and carefully measure you finished handloads to make certain that they will fit in the chamber with adequate room for safe bullet bullet release. (Typically .002" or more even though some benchrest shooters will use slightly less).

Hope this helps.
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Old 04-13-2006, 08:02 AM
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Re: question on tight neck chambers

My only comment would be that I would not deliberately set up a BR with a .262 neck. that is very thin and only normally used on the PPC. The case necks are subject to damage very easily and no need for it.

I would recommend that if you are ordering your reamer for a 6mmbr, look at some of the threads on this subject at www.6mmbr.com.

Most are recommending that the 6mm BR either be a .271 no neck turn neck or at most .267-278.

I just got a 6mm BR-DX (ack imp) reamer at .269 for new 600 yard gun.


BH
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  #7  
Old 04-13-2006, 08:29 AM
 
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Re: question on tight neck chambers

You will be surprised at the performance of a 6mm improved when you get it built.I will push a 243ackly very hard.I have both and hope to do a article later when I get all the data together.
Old Bear
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