Don't really know if I have a problem, or not. Doing some final load testing today in preperation for the up coming season, and after about 30 rounds of 165gr NBT's, pushed with 83.2grs. of H-4831SC, CCI #250 mag primmer, Weatherby 1x brass--I noticed on the bolt head, a build up of veeeery fine "brass dust/shavings. This is a Mark V Weatherby. Absolutely NO signs of distress in the brass. None of this dust was present in the chamber, but my son noticed a minute "greenish film" on the bottom of the scope (wiped right off) like smoke residue. I know I'm not pushing this load, and the lock up on this rifle is like a vault--have no idea!! Suggestions

?

The brass dust/shavings is common with push feed rifles and is caused by the extractor shaving brass when the bolt is turned down or opened up. Don't sweat it.

Don't know about the "green film".

gkdir,
I have been a Weatherby shooter for over 40 years, all Weatherby calibers, except for the .224 and the .416 and I seen this fine shaving many times. I don't think you have anything to worry about at all. On my Weatherbys that is caused by the extractor sliding over the rim of the case head, or in the case of very hot loads or old factory loads that were loaded to 71,000 psi the base of the case would flow into the plunger recess (ejector) in the bolt face. In the case of the latter you would know, by sticky bolt lift and the brass disk that would be shaved off the case head everytime you opened the bolt after each shot.

In your case, I think you might a very small edge or rough spot on the extractor.
Good shooting,
Marcus.