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Neck tension-- how much ???

 
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Old 10-12-2010, 10:26 AM
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Re: Neck tension-- how much ???

Quote:
Originally Posted by Mikecr View Post
Woods, yes frictional differences affect pull force. But this is not a factor.
A neck fully expands on firing before the bullet has moved.

What does affect tension in a meaningful(and useful) way, is the amount of neck sizing length. This can be useful for tuning with some component combinations.
I start off with one cal of neck sizing at 1thou under(after springback).
Just an easy standard for me, that's worked well w/regard to ES.

Some day I'll play with it further(best load over wide temp range-vs-tension).
But my main focus has been tension variance, as compared with an instrumented mandrel.
So witch one would used if you were me for my 7mm stw 0.002 or 0.003 for lower ES. Thanks for your input. Joe
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Old 10-12-2010, 05:35 PM
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Re: Neck tension-- how much ???

Start 3thou - 1.5thou sprgbck, for ~1.5thou tension on ~.280" worth of neck.
I think you'll find this is sufficient bullet grip, while providing consistent seating pressures and resulting seating depths.
You might even give 2thou under a try, as the lowest tension you can get away with produces the lowest tension variance. But that don't guarantee lowest ES(there are more factors there).
For your load you might need high tension. This you experiment to by varying the depth from .280 to maybe .300(+), or .250(-) for less tension.
And then, it can be a double edge sword in that running high tension, invokes annealing more often, or tension variance will grow to the point of diminished returns(climbing ES, opening groups).

I suspect this is more of a tuning aid for those who are not jammed.
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