Take a look at the video below. When I use my Hornady OAL gauge to push the bullet up to the lands I hit a good deal of resistance, if I push a little harder the bullet then slides up and stops (at what I assume is the lands). When I pull the bullet out it has these marks all the way around. This happens every time I try it. I have confirmed those marks are not from the case nor at any point during ejecting. Took it to the local gunsmith and he said “I don’t know, weird.” Thanks...He used a bore scope and didn’t note “anything out of the ordinary” but it seems like something is.
Anyone have any ideas. This is a Christensen ELR., chambered in 6.5 CM. The bullet is a 140gr Berger VLD Hunting.
Run it in to where it first meets resistance and measure the OAL. Its either going to be a bad throat or your lands are not as far out as you think and you're in them. I think ButterBean is right, though. If that's not the lands, then your throat is too tight and needs to be touched up. A standard finish reamer will clean it up with just a few passes.