diderr, I have used the Hornady (formerly Stoney Point) OAL gauge for years. It allows you to measure the OAL with the bullet touching the lands. At this point, you can adjust the seater to the length you want with a micrometer. Check out this link. There are a couple more pieces that you will need to go along with this.
https://www.hornady.com/shop/?ps_ses...a34eaef6e83165
