Here is the deal. Father in law has a new factory Remington in 300 Win Mag fluted stainless. We bought new Remington brass and loaded some rounds with 180 grain accubond. Powder 75 grains 7828 ssc. Seated .040 off the lands. Mid load by book he also tried a low end load with IMr 4350 and 4831. Bolt twists no problem but the brass are sticking and with a little work they have came out. There is a mark about .090 in front of the belt of the case where they are sticking. No pressure signs on back of brass or primer. However the sticky ness leads us to think pressure. Measure the brass at the sticky spot and they are at specs .513. Has anybody seen a spot in a new rifle that just needs smoothing in the chamber area before? Is this a pressure problem? Any thoughts are appreciated!