Creedmoor shooter
Well-Known Member
I'm not sure this is a problem or not. Rifle shoots fine. But I'm getting some soot around the shoulder of my cases. Never goes past the shoulder. It didn't do it on virgin brass but now it's doing it on sized brass. I've tried no shoulder bump, .002 bump, and longer but no matter what it still does it. 6mm creedmoor running a 109 berger at 3070ish fps. Here's a pic of the shoulders then some groups I shot yesterday. Just curious if anyone has an idea as to why it's doing this all the sudden