Generally speaking....I like to start about .005 from the lands. Some of my rifles like the bullets seated out so the engage the lands. This will increase pressure and has to done with extreme care. Seating the bullet deeper into the case or away from the lands creates freebore which reduces pressure. Weatherbys are notorious for having excessive freebore for this precise reason. Of course, if you start compacting the powder by seating deeper into the case, pressure can increase. Tweaking the seating depth is an age old way to find your best accuracy with a load.