I recently purchased a new rem. 700 CDL in 300 win mag. Went to the range today with a box of federal 180 grain power shocks to see how it was going to shoot, rounds chambered fine, but extraction was difficult, one round required a cleaning rod to tap out and a buddy pulling on the bolt. Brass is really shiny just above the belt, same problem with my reloads. Gun is clean, primers are not flattened, bottom of the brass is not smeared, bullets aren't touching the lands. At a loss, any advice would be greatly appreciated.