Thread: New to reloading problem

To know your neck tension measure your mandrel and bullet diameters, the difference is your tension, probably 2-4 thou of an inch. If the difference is less, then you need to chuck the mandrel in a drill and polish with 400 wet and dry and reduce the mandrel diameter. Check the mandrel diameter often until you get a min 2 thou difference between bullet diameter and mandrel diameter. Go for as much neck tension as you like, but dont go crazy.
Even with 2 thou tension, pressing the bullet in a loaded round against your bench with considerable force should not move the bullet in the neck.

As mentioned, read the setup instructions carefully. They do mention 25 lbs of force to squeeze the neck against the mandrel and rotate your brass 1/4 turn and size again.

Another way to see if you are sizing is to measure your neck outer diameter, size the neck and measure again and see if it sized.