A bore scope can sure tell a story. The barrel is a 1 in 10 twist 3 groove SS 257 lilja chambered for the 257 Weatherby. It has been retired with 836 max pressure rounds through it. Used 115 Berger vlds till they began to become destroyed at round count 550 then switched to moly'ed 115s then had to switch to moly 110 accubonds. The view through the borescope is a horror show.
Throat is cracked like a dry clay pond with tiny squares and cracks/crazing everywhere. There are also fissures that run longitudinally along with the cracks for 18" up the bore!!! It cleans up with DAYS of soaking and pushing patches with Bore tech eliminator. It takes several foulers to straighten it out and much past 25 rounds it begins to open up.
I retired this barrel after realizing it has limited shooting before it opens up. It may be rebored/rifled to a larger bore in time.
