Why do you have such a huge gap between loads? Some may differ, but most of us have a way on how to work up a load. With the 06, I would load starting with the minimum starting load and working my way up 1 grain at a time, until I reach max (always start with the minimum load). So, for example if the starting load is 53 grs, and max is 58.8 grs, you should end up with loads of 53, 54, 55, 56, 57 & 58 & 58.8 grs. Once I find something promising in one of those loads, then I'll go into the decimals, and will go half a grain up and half a grain down with that particular load, and play within that one particular load. If I'm happy with the load, then I'll tinker with the col. Also, don't be surprised if the starting load is accurate, which is the case with my 06, but I'm using IMR-4350, and shooting 180 grs.
Do you have a chronograph? Some shooters like them, and some do not. I'm the one who likes them, and the chrono will help me know the velocity of my reloads, and I sometime compare them to the published book velocity to see if I'm close (Which BTW, doesn't mean squat because the reloading company are using a completely different rifle and most likely different components).
Also clean your barrel real good. Everyone has different solvents they like, I like Bore Tech Eliminator, and I believe in it.
I hope I didn't confuse you, and if I did, holler and I'll try to answer your questions. Good luck to ya!