The op's barrel has cratering at the lines which lead me to believe a mtl issue. Could be from a button I guess.
This is a button pulled Savage with very few rounds. Not for the timid as noted above.
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An unfired Ace barrel, better finish than my Bartleins.
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And everyone thinks a cleaning rod can damage a barrel. If your cleaning rod will put a scratch in your barrel then I’d hate to think what a bullet would do!
I guess I’ve never even considered using an uncoated rod, or not using a bore guide, or not using aluminum jags/brushes. So your ignorance comment is spot onIt happens. Steel rod, copper brush with grit, excessive crown damage from not using a guide... Take your pick. It's usually a strong desire to do something mixed with ignorance. We've all learned lessons the hard way at some point in life.