Parashooter

You're seeing soot on the necks because the bullet base is leaving the case before the neck has expanded to seal against the chamber. This is to be expected with a short bullet and a ~34000 psi load, which is what you're shooting.

If the soot bothers you, there are several approaches that may eliminate or reduce it -

Heavier/longer bullets
More powder
Faster powder
Seat bullets deeper
Anneal necks
Size necks only to depth bullet is seated
Thanks parashooter great feedback Wow! To maximize my POI, i seated close to the rifling, and with 150gr i will get some soot like you said. i don't mind its good. check out my thread on the Enfiled side of this forum.
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