With Barnes bullets, I seat .050 off the lands.

All other cup and core bullets, I seat just barely touching the lands. If accuracy is not small group with the best load, I start jumping .005,.010,.025, and in .015 increments till I'm jumping .060.

I have one 270 and a 25/06 that likes jumping .040, everyother rifle that I own shoots tiny groups with the bullets touching. The 7 Mag is the most demanding of up against the lands seating depth.