Load Development Help - Rifle Went Out of Tune

[treillw]

Got the teslong. Here is a video of my barrel. I'm no expect, but it doesn't look terrible?? I think I can see the carbon ring at the lands which some of you spoke of. A few stripes of copper. White spots as well - what in the world are they?? Looks like I need to oil my chamber. What is a good way to go about this?

Thanks!

WIN_20211213_17_15_44_Pro.mp4

drive.google.com

 

[WVRJ]

It looks like there are some pits that may have caused by moisture and rust,but they seem to fill in with copper as it's shot.I have a 25-06 barrel that's way worse than yours,but it still shoots great.I think moisture can get into the carbon fouling in the barrel and cause those little rust pits.Anything I have that's not stainless gets a lightly oiled patch through the bore at the end of a shooting session.Also,I've had a couple scopes go bad on me and cause something similar to happen.No real bad change in group size,just a noticeable one.