I start with a 5 round pressure ladder, take the lower load and run a seating test at .010, .020 and .030 of the lands to get me roughed in. Load up a ladder in .5 gr increments and shoot at 600+ yards. Load up three round groups in the nodes and shoot at 1000 then take the load from that and load up two sets of three for seating depth .005 on each side of where I'm at. That load I take and get an average velocity from and then shoot at 100, 300 to tune zero, 600 then 1000 to tune speed then 1500 to confirm the solution. Usually takes 25-50 rounds for a decent hunting load per bullet.
You can short cut this significantly if you have worked with the same reamer used to build the gun.
I have to do the same work with a Hammer as I do a Berger, work with a bullet enough and you'll find what works faster.