I loaded some 168gr SMK into once fired LC brass. I set the COAL to 2.806". The manual being used showed a min of 2.800" and a max of 2.810". At the range, I chambered a round, and immediately had difficulty trying to push the bolt handle down. I pulled the round out, chambered another, and again, it took some force to lock the bolt. I did not fire any rounds. Went home, checked my COAL's, and they varied between 2.803" and 2.809" - still in spec... I loaded and cycled the bolt with other ammo. The ammo was much shorter, but the bolt cycled 100% I chambered some of the empty LC brass, and it was fine to cycle. Looking closely at the loaded bullets, and I think there is a light scuff from the lands. Is the ammo safe to shoot if it touches the lands? Did I do something wrong e.g. rely on COAL? Should I re-seat the bullets slightly deeper?