Just acquired the Teslong with the rigid tube and digital display. Taking pictures is a bit tricky, but the image quality is good when the mirror tip is positioned for sharp focus. My warranty replacement .460 S&W carbine barrel looks just like Jim in Idaho's Ruger SP101 revolver barrel. Corduroy-like tool marks in the grooves at right angle to the bore axis. Perhaps worse than the one the manufacturer replaced. I wonder how old Jim's SP101 was....sure doesn't look like a hammer forged barrel.
Anyone know how this happens? Some things I thought of include oversize reaming, undersize/worn carbide rifling button, drilled but not reamed before rifling.
