Thread: Reloading Poser

Treble 2? Should last forever.
Check the muzzle with a magnifying glass. Check for sharpness of the rifling and for any rifling lands that is different to the others.
Back in the day gunsmiths didn't have borescopes and even now some don't.
Run a cotton bud around the edge of the crown. Any loose thread indicates a burr or rough spot. This is usually an issue with new rifles though.