It would seem that if you have measured your chamber using a comparator (cartridge case and sample bullet) and determined the measurement from cartridge base to orgive touching the lands, and deciding how much off the lands you wanted to be, just load to that dimension. Variations in bullet...
I'm a life-long hunter, shooter and reloader. Like my .375 H & H mag, shooting it in Alaska and Africa, moose, elk, buffalo, kudu and gemsbok. Lots of jackrabbits with a .22 LR. Just bought a 20 lb .338 Lapua in Ruger Precision Rifle, having fun working up an accurate load. Welcome suggestions.