It's always prudent to start off the lands in the beginning with moderate powder weights for the cartridge/powder combo that you'll be using in the beginning and then work UP and IN.
For a box of 50 cartridges, load 10 rounds at .005" off, load 15 rounds at .010" off, load 15 rounds at .015" off and then load the final 10 rounds .020" off and see what you see.
You can break that combo up into whatever batches you prefer, but you get the picture?
The salient point here is that you should tell us what YOUR rifle system prefers, not the other way around.
Chris