DShortt
Gold $$ Contributor
I have found several of those and I don't go through many barrels. Either I have the worst luck ever or this is much more common than most would believe.I had a new .243 factory barrel that was driving me bug frog. It would sorta shoot, then spit one, etc. Luckily, that was back when components were readily available. Wasted about 200 rounds. Picked up a Lyman borecam. Turns out that barrel had a crooked leade. The "ramps" leading up to the start of the lands were shorter on one side than the other. It got added to my garden stake collection.
I'm guessing it's the second possibility.