I have been using Lyman "M" dies for 40 plus years. They are the best as they go deeper in the case also the put a set for the bullet to seat in and bevel the mouth of the case for seating the bullet. In fact I use one in my Dillon 1050 set up for .223. I took the rifle decapping pin out of the sizing die and put in a straight pistol decapping rod. The Old style short Lyman "M" die goes in the third station after the power drop and since it is shorter it doesn't go down into the powder. I can seat the bullet in the slight step left by the "M" die. The seating die smooths out the expanded step. There is no lost of accuracy as my varimet rifles all shot less than 1/2" AT 100 YDS. Plus there is the added plus since the expanded is not pulling out of the sized case and the cases don't stretch as much and a lot less trimming is needed. I do this as I can do 1000 plus rounds an hour on the Dillon 1050 and I don't get my bad left hand fingers in the way when seating the bullet.