The cocking piece will drag the sear on every bolt action gun. The sear is under spring tension and is constantly being pushed up against the cocking piece. If it were not the cocking piece would not engage the sear when you rotate the bolt.

Check the caming angle that is cut into the rear of the bolt. Look for gauling either on the camming angle on the bolt or on the forward part of the cocking piece. This angle draws back the cocking piece back so that the sear will connect with the cocking pieces engagement surface. If there is any gauling on either of these two pieces your bolt will become very dificult to open.