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neck tension

 
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  #1  
Old 05-02-2006, 02:40 AM
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Join Date: Feb 2006
Location: Nottingham, UK
Posts: 261
neck tension

hi all
i have just miced my brass necks and they come up at 13thou so i have doubled it = 26 thou + my bullet 243 = 269
at the present time i am running a 265 bush,so i have 4 thou of neck tension,what is the best neck tension to run on.i was thinking down the lines of getting a 267 bush and go with 2 thou as it is a fox round and will need to be chambered and un chambered. will 2 thou be OK.i don't have a mag only a bullet holder on the stock.(uncle Mick's)
what tension do you lot prefer.or will 4 thou be ok.
is it worth changing it??????? [img]/ubbthreads/images/graemlins/confused.gif[/img]
thanks
Colin.
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  #2  
Old 05-02-2006, 05:58 AM
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Location: Northamptonshire England
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Re: neck tension

Hi Col its me again,
I am using a .267 bush for my Ackley but i have done a light .0005 neck clean up.
My loaded round dimension before turning was .270, so after turning i have .0025 of neck tension, works well even when unloading a round that is .005 into the lands.

Ian.
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  #3  
Old 05-02-2006, 06:20 AM
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Re: neck tension

An old rule of thumb on neck tension to grip the bullet firm enough for just about all uses is to have the neck sizing part of the die (bushing, or whatever) 1% smaller than a loaded round neck's diameter. If your loaded rounds have a .269-inch neck diameter, then the neck sizing part of the die should be .26631-inch to follow this rule.

Your choice of .267-inch for the bushing is great. Depending on the ductility of your case necks, you may need to use a .268-inch bushing if they don't spring back enough; or a .266-inch one if the neck springs back too much.
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Old 05-02-2006, 08:04 AM
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Re: neck tension

[ QUOTE ]
An old rule of thumb on neck tension to grip the bullet firm enough for just about all uses is to have the neck sizing part of the die (bushing, or whatever) 1% smaller than a loaded round neck's diameter. If your loaded rounds have a .269-inch neck diameter, then the neck sizing part of the die should be .26631-inch to follow this rule.

Your choice of .267-inch for the bushing is great. Depending on the ductility of your case necks, you may need to use a .268-inch bushing if they don't spring back enough; or a .266-inch one if the spring back too much.

[/ QUOTE ]

so Bart you are saying i have to much neck tension on my cases. will this make 4 in to .3 then 1 away at .5





i do not think the flyer's where made by the driver (me)
sorry for the bad pic i only have a phone one.
can you shed any light on the matter.
if you look at the groups they look exactly the same.
and they measure
group 1
the 4 on there own .328 with the 1 out .657
group 2
the 4 on there own .305 with the one out .594
so what you think [img]/ubbthreads/images/graemlins/confused.gif[/img]
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  #5  
Old 05-02-2006, 08:09 AM
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Join Date: Nov 2004
Posts: 878
Re: neck tension

[ QUOTE ]
is it worth changing it???????

[/ QUOTE ]

Maybe, is it shooting? [img]/ubbthreads/images/graemlins/smile.gif[/img]
I usually start at .003" if its a mag fed rifle, and .001 if its a single shot, then adjust neck tension as a final element of the process when tuneing a load. HOWEVER: if its shooting at .004", why fix whats not broken?
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  #6  
Old 05-02-2006, 09:20 AM
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Join Date: Dec 2005
Posts: 2,114
Re: neck tension

[ QUOTE ]
so Bart you are saying i have to much neck tension on my cases. will this make 4 in to .3 then 1 away at .5

[/ QUOTE ]No, they're about right if your accuracy is good.
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  #7  
Old 05-02-2006, 09:32 AM
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Join Date: Feb 2006
Location: Nottingham, UK
Posts: 261
Re: neck tension

[ QUOTE ]
[ QUOTE ]
is it worth changing it???????

[/ QUOTE ]

Maybe, is it shooting? [img]/ubbthreads/images/graemlins/smile.gif[/img]
I usually start at .003" if its a mag fed rifle, and .001 if its a single shot, then adjust neck tension as a final element of the process when tuneing a load. HOWEVER: if its shooting at .004", why fix whats not broken?

[/ QUOTE ]

hi abinok
would you think that the 1 away is driver error??????
its just bugging me,they should all be in the same ball park with the stick I'm using. [img]/ubbthreads/images/graemlins/confused.gif[/img]

i am going to go up in powder and try some different neck tensions .1 .2 and .3 just to see if i can get that one in a bit more. then go out and shoot some data.
unless anyone can cast some light on the one away
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