308 Concentricity Issue....possibly seating die?

[ireload2]

Competent machining process planning results in machining both ID and OD features at the same chucking. This will result in zero run out.

 

[blastit37]

My 30-06 Redding comp seat die has always had a variation of up to .004 TIR on loaded rounds. This thread prompted me to check the RO of the hole in the sleeve and found it was .003 TIR. Going to order a Wilson seating die. Thanks for getting my old brain thinking about the problem and not just thinking it was me.

 

[farmergreg]

My 30-06 Redding comp seat die has always had a variation of up to .004 TIR on loaded rounds. This thread prompted me to check the RO of the hole in the sleeve and found it was .003 TIR. Going to order a Wilson seating die. Thanks for getting my old brain thinking about the problem and not just thinking it was me.

The sleeve can be straight and still have acceptable runout.
If it has different runout on each end, IE .001 at the cartridge base and .004 at the seater then the hole isn't straight and I would think this is a source that compounds finished bullet runout.
Also for giggles I spun some seater plugs (tapered inside where it touches the ogive) I found one of those out .002!