Take all of the bullet crimp out and load a bullet long, use a sharpie to paint the bullet, load it in the chamber, look for where the sharpie is removed, that is where it touches the lands, load your bullet deeper and resharpie the bullet and keep doing that until you are just barely touching your lands. That is your bullet depth to lands. You might have to use 2-4 different bullets and cases. Then you adjust from there for accuracy. Every gun is different.