Re: How to reduce bullet runout?
"2. I'm getting quite a bit of runout on the case neck after bumping shoulders back with the lee full length sizing die."
Low run-out with bottle neck cases depends almost entirely on straight necks and that means both good brass and excallant sizing/expanding methods. ALL conventonal expander buttons tend to pull necks out of line but Lee's long expander section is perhaps one of the best conventional types.
For factory rifles, light neck turning can help but don't bother cutting more than about 75% of the neck circumference if you do it. We can turn a perfectly concentric neck that is such a lousy fit in the chamber it may well be worse for accuracy, not better.
With carefully selected and lightly neck turned brass, I prefer to FL size with a body die which doesn't touch the neck at all. Then I usually use a Lee Collet neck sizer die because it makes the straightest necks I've been able to produce. If I'm neck sizing with the Lee die alone, and I often do, I dispense with the body die.
IF I have to use a conventional FL sizer, I first decap with a universal decapper and remove the expander/decap rod from my FL sizer. After sizing, I use a Lyman "M" expander die which works by pushing IN rather than pulling OUT and that makes necks almost as straight, on average, as the Lee Collet neck sizer.
We may measure run-out any way we choose but I disagree with Kranky's method only because it will automatically give lower readings than the bullets actual, full length tilt.
I prefer to measure bullet run-out as near the tip as possible so I can to see the maximum difference possible. That way I can more easily gage the results when I change methods or tools. When my cartridges read .002" or less TIR, I know I have some straight ammo! (Total Indicated Run-out is twice the actual tilt of the bullets.)
Can we bend the bullets to improve run-out? Sure. If the seating depth is slight it may even help accuracy. But, if the bullet is seated deep, I fear we may get a "straighter" round at the expense of some degree of compression damage to the bullet's thin jacket and soft core. I prefer to work on my cases, loading tools and methods for straighter ammo rather than bending them straight.
Last edited by boomtube; 10-26-2008 at 07:56 PM.