IF you have the mag OAL, seat them into the lands about .020, If not, seat them as far out as the mag will allow and then work backwards.
That way you only have one way to go. No point seating in the middle and then trying to figure to go up or down.
Do not make little .005 jumps. test at .020-.040 intervals to find a spot and then fine tune.
I'd start at magazine length and go from there. Oddly enough the best load in my .308 Broughton using the 165 Accubond is at .125" off the rifling, which is magazine length. Loading the bullet closer, @ the rifling, or into the rifling resulted in larger groups.
In a hunting rifle I'd much prefer ammo that fits & feeds from the magazine. In my .308 I was lucky that this length also produced excellent accuracy.
To each their own. I'd never tell someone to start off by seating a bullet .020 into the lands in a hunting gun.