Thread: What causes this

The real quetion is how do you set up the Seating die?.Because a VLD is a boat tail (I assume) and the tolerances on the Lee dies is not that fine.
The way I set up a die is to put the case in the holder and then raise the case to max height .Then screw the die onto the case and back it off maybe half a turn,then with the projectile seater at max screw it in a bit at a time untill seating depth is set,with long projectiles sometimes you have to backup the die more than half a turn.
It is possible to size the neck too small ,but only measung the inside of the neck will tell you but I dought that is your problem.Another is check you have the right size projectile ,it's sometimes the most obvious things that we overlook.