Wrinkled necks when formed from 6Gren ??

[StoneHendge]

Without a picture it's hard to tell what could be going on, but you might be experiencing hydraulic sizing, which is when an excess of lube gets caught in the neck/shoulder area. It has nowhere to go as the case is pushed into the die so the brass gives. The solution is to wipe excess off of the neck and shoulder before sizing. Overlubing is certainly understandable when converting brass. It's something that's happened to me more with straight 6.5 brass than converting it, likely due to less shoulder area when it stays at 6.5.