I can't remember where, but I remember reading somewhere that once you find the optimum distance from the lands for a particular rifle with a given bullet, you can seat another type of bullet to that distance and that will be the optimum distance for that bullet as well. Is this true? I am wondering because I have a .270 Winchester that will shoot cloverleafs all day long with 150 grain Speer boat tail spire points. I would like to load some 140 grain Nosler Accubonds to try in that gun and if this theory is true, it might save me some time. Thanks.