If it's factory ammo, just try another box of a different lot number if possible.. If misfires still occur, then begin the process of elimination with the rifle..
It can be several different or concurrent factors such as weak striker spring (resulting from storing firearm with a cocked striker), something impeding the full movement of the bolt handle into the down position, a piece of primer or crap that got into the striker recess and interfering with full forward travel, etc., etc...