6ppc neck clearance ??

[Carson]

At this point, I wouldn't worry about it. Have you taken a look at the six segments of Jack Neary's workshop on Youtube? I believe that in one of them he speaks to this very issue. How much smaller is sizing making a tight case a little above the extractor groove, and how does your zero bump case feel when you chamber it?

Wow!

Those were some great video's. Shooting used to be pretty simple. Now it seems the more I learn is that I don't know much.

Link for the first one;

Jack Neary Rifle tuning part 1

https://www.youtube.com/watch?v=7SZWvn68bRU