Wrinkled necks when formed from 6Gren ??

[r.tenorio671]

    .....due the lack of available 6ARC brass, I converted new Starline 6.5 Grendel brass to 6ARC.  The conversion was actually pretty simple and easy, for me at least.

My process:

1. New Starline brass from bag to annealer.
2. Lube (alcohol+lanolin mix) and size in my Hornady die (Hornady Custom die set).  I DID NOT remove the expander button.
3.  Trim to 1.490" on Forester Classic trimmer, chamfer case mouth in & out.

When I was setting up my sizing die, I used Imperial Die Wax as I was working with a single casing at the time, but after die was set up, I went whole hog as I use a progressive press (Lee Loadmaster).  I found that the pre-annealed brass had a more defined shoulder and virtually no springback as opposed to non-annealed brass, also the consistency of the shoulder bump was better with the pre-annealed brass and required less force on the press handle.  Neck tension was great, seating was no issue and bullets COULD NOT be pressed inward when tested on counter-top or during loading from mags using bolt release.