Thread: Tight chamber and marks on projectile

Mystery solved round two. Damage to throat/freebore.
Hi team, I just got the borescope so when in motion things seemed clear to me but I can see how the static pics can be confusing. Ran a bit more tests and tried to get the screen cuts in focus, so hopefully this helps.
Photo 1, borescope without mirror, the circled part is where the deformation is.

Photo 2, borescope with mirror, center of mirror is how the damage looks like from another angle.

Photo 3, borescope without mirror. Jammed a round in there, can see the copper jacket scraped and left on there. explains the tight chamber close and loss of accuracy.

Photo 4, borescope with mirror. The copper jacket looks really obvious in this one.


I've really tried cleaning but it was at best clean the scraped copper jacketed, I do believe this is a gun smith job now if not buying a new barrelled action job
Still thanks a ton for the support and knowledge from the team. Learnt lots and lots, keep all that wisdom and experience flowing please!