The bullet seating plug that comes with the die set is as close to generic as we can make it. If you find that the bullet seating plug deforms the nose of the bullet you are trying to seat, or does not seat the bullet deep enough, we can make a custom bullet seating plug to fit your bullet. For this we would need a sample bullet and the cost would be $8 plus any applicable taxes and Shipping/Handling.
The seating plug does not seat the bullet by pushing on the nose of the bullet. It is a hollow punch that pushes on the ogive of the bullet. Because of that, any differential between the point the bullet and the point the bullet seating plug contacts the ogive results in variable overall length. +/- .010" is not unreasonable.
If you want to confirm this, remove the bullet seating plug from the die. Place it over the bullet and now measure overall length of several rounds. It should be more consistent.
