The bolt on my Rem 700 7mm Mag sticks and takes a lot to eject cartridge after firing. I cleaned the chamber, and it helps, which tells me that was at least some of if not the problem. The gunsmith I brought it too said he could find nothing, and the bolt appears to be wearing evenly. Any ideas on how to resolve or identify to cause of the problem. Bolt picture attached. Any other ideas besides cleaning? Don't have another long action bolt lying around.