Re: I'm new, did i mess up my barrel?
Pretty typical on factory barrels, One thing you might want to check is have someone w/ a borescope to look inside to see if there is any rust. If there is then yes you ruin the barrel, from improper cleaning or storage. I've seen this many times w/ blued barrels. Also a 3 piece aluminum rod can damage the barrel quickly if carbon and dirt gets in the joints. Did you use a bore guide? Also if you didn't let it cool completely after 3 shots you can burn the small barrels with those cartridges easily.
Also your rifles are hunting rifles not target rifles so treat them that way, don't shoot targets constantly with them, find a load and put them away, after properly coating the insides w/ oil, then don't forget to patch them dry before shooting again.