Trim 6.5 Grendel brass BEFORE or AFTER sizing to 6-whatever ?

[Pig_Popper]

Seems there are more trimming components for 6.5 Grendel versus 6-ARC and 6-Grendel ...

So those of you who are trimming - are you trimming before necking down to 6mm or are you seeing where you end up and using magic to trim 6mm.

I figured LEE precision would have a zip trim gauge for 6mm by now but Nope......