Re: Neck Sizing Bushing Advice....
[ QUOTE ]
I am kind of surprised that you are experiencing less neck tension after the first firing. If anything, with the carbon residue left in the neck I'd expect bullets to seat a bit tighter.
Either way, with a hunting rifle that will be fed out of a magazine I would drop the neck size bushing by .002". In my experience, slightly tighter necks may enhance accuracy too, but in a hunting rifle you will probably never see any difference.
[/ QUOTE ]
Go a thou tighter.
VH -- the brass hardens after the first firing, and creates less tension. my guess is it doesnt take to the sizing like virgin brass.
I have seen this too, even when moving the neck only 0.001 or so and starting with less than 0.001 tension.
so i'd expect it to be worse with factory chambers and tolerances.
RE: thickness of carbon - i hit my necks with a worn bronze brush in drill inside, and steel wool on the outside so they are clean (and yes, they still measure the same thickness as virgin)
i doubt the carbon buildup on the inner neck is measurable, but then again, i have never tried to measure it with my 0.0001 ball mic.