Re: Resizing Bushing Size Question
If you partially NS your only going to produce ~2thou of springback tension(bullet grip) which is enough, and additional downward sizing would just be wasted.
More tension can be produced with FL/partial NS only as long as the sizing length is beyond bullet bearing seated.
I don't like FL neck sizing, and would not do this.
Whether you want very high tension, or very light, depends on the cartridge and it's need of pressures to perform. Seating w/resp to lands can come into play as well.
For example; If your expecting grouping in the 1s-low2s with a 30br, then you'll need to jack the pressures way up to burn the powder from a short barrel capable of this. Probably try it Jammed, but if best accuracy ends up off the lands, then it's gonna lead you to higher neck tension to get your pressures back(while not jammed).
Many shooters assume that high neck tension is beneficial. But this is usually not true.
Most of us aren't shooting jacked up underbore cartridges.
Lighter tension, means lower tension variance, and bullet jamming is a far bigger adjustment to load than neck tension anyway.
Just a matter of what it takes to get a load your barrel/cartridge likes.