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Neck Tension in 6bra

urbanrifleman

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I would say my neck tension is "light" in the Wilson seater. I shoot moly bullets and I clean the necks with a brush before seating (which really fixed a lot of stuff), and my bullets have a very even feel when seated. But very light like I said. Seating lengths are outstanding from round to round. I shoot the Berger 108.

I have the barrel shooting very well, but I thought I might try smaller bushings.

I was told by an experienced shooter that my consistency will probably suffer after going smaller.

Thoughts?
 
It's very simple, try it and see. I shoot heavy tension with the PPC but light with the BRX. Very easy to find out. Since I have got into 1000 yds it seems most shooters I talk to say light. Again very easy to find out what your gun likes.
 
If you're partial neck sizing (as a Wilson does), and seating no more bullet bearing than sizing length, then the tension provided by 1thou interference is all you're going to get, regardless of change to greater downsizing.
This, because further downsizing will simply be expanded/upsized away with bullet seating (at greater seating force, and depth variances).
Here, you can adjust neck tension through LENGTH of your bushing sizing, as tension is spring back force per area that force applies to(PSI).
 
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If your partial neck sizing (as a Wilson does), and seating no more bullet bearing than sizing length, then the tension provided by 1thou interference is all you're going to get, regardless of change to greater downsizing.
This, because further downsizing will simply be expanded/upsized away with bullet seating (at greater seating force, and depth variances).
Here, you can adjust neck tension through LENGTH of your bushing sizing, as tension is spring back force per area that force applies to(PSI).

I have done this with my 243.
 
We can't measure neck tension directly, as we don't have a tool that does it.
We can measure only seating force and muzzle velocity, which are affected by tension.
 
On a 6mm case the max. spring back is .0005 and if you shot Spencer bullets or one that the pressure ring is .0005 larger than the shank you had zero neck tension no matter what bushing you used. I went as far as .005 under the loaded rounding had nothing. seat them .010 into the lands and it would pull the bullet. I learned to make them shoot jumped...... jim
 

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