I have a Gen 3 G34 with at least 60k rounds through it. Almost all of those rounds have been minor rounds. I'm now starting to see about 10% or more of my rounds tumble when I haven't cleaned my barrel for a couple thousand rounds or so (a recent development). - Never was a problem before. When I clean it, they stop tumbling for a bit. Before cleaning there isn't any noticeable buildup or burrs. I would think it could be my reload, but my son shoots the same ammo and quantity I do, on the same cleaning interval, in his Gen 4 G34 without this issue.
Is it time to replace the barrel? How can I tell if the barrel is worn out?
Thanks