6 CM reloading question on resizing and how much bump to give the shoulder?

Big Moose

Sergeant of the Hide
Full Member
Minuteman
Aug 21, 2018
106
28
This is for a 6 CM gas-gun

Original length to shoulder on new Lapua brass 1.520, length to shoulder after firing 1.528, so 8 thou. Should I be looking to do 3 to 4 thou of bump, or more?

Thanks.