[4T4MAG]

I am working on my loads for my Savage 22-250. I noticed carbon/black right at the base of the neck before. It is a factory barrel, is this carbon residue due to the slightly larger neck chamber on the barrel? The loaded cases loan and eject with no issues. It does the same thing regardless of the brass, Lapua, Win, Rem, Horn Etc. My guess this is either large chamber or when my powder burns it is not burning fast enough. I am using 33.6 varget.

Also, on the head stamp I am getting some abrasion from the bolt face. It is a Savage factory bolt head. Could this be corrected by getting a new bolt head like a PTG? Does the Savage action really benefit from truing?

I am not noticing any pressure signs.
I have included a pict of the neck, case head and my latest target. (Should I be complaining @ 200yds?)