Um, no lock nut
, but there is a lock-ring on lee dies, it adjusts with o-ring tension, And should have plenty of adjustment to seat bullets. Are you sure the die is in the press enought (case in shellholder, raised up, screww in die untill it touches case, then lock (for no crimp, 1/3 -1/4 turn further to crimp) THEN adjust for bullet depth. hope this helps, i use all lee stuff.
MC