Use gas check seater not a washer

[bhp9]

I recommend a gas check seater rather than just using a washer placed over the sizer die. The gas check seater will allow the gas check not only to be seated but will enable the bullet to go slightly into the die so the die can put a slight crimp on the bullet so that when handling the bullet later to lube and size it the gas check does not fall off or move into a cocked position when putting it into the lube die.

Just another case of using the right tool for the job as cutting financial corners by using a washer is not the way to do it properly.