Weird sizing issue

[Dmagna]

Using ADG 300 prc brass I am having a weird sizing issue. Fired case after annealing is .340 i size down using a .333 bushing but it ends up at .330. So I use a mandrel to .335 then size again to .333, loaded brass is .335.

I have never ran into this issue, I have been loading N570 and my load was at 3030 with no pressure. I just upsized my bushing because my 331 bushing was sizing the brass to .007-.009 neck tension. My SD and ES went crazy, I guess the extra step won't hurt. Just annoying.

 

[ShtrRdy]

When using the neck sizing bushing approach you need to limit the diameter sizing step to 0.004" or less. You'll need to first use a 0.336 bushing then use the 0.333 bushing.

 

[Dmagna]

When using the neck sizing bushing approach you need to limit the diameter sizing step to 0.004" or less. You'll need to first use a 0.336 bushing then use the 0.333 bushing.

Okay