Master Blaster, you're just scratching the surface here.
The ‘aught six is has been around for a long time and it would be surprising if there weren't a bunch of different opinions on loading for the round. Likewise, there is really no One True Path to Success. I bet every opinion expressed on this topic is true and valid for the poster and his/her rifle. Check out the details of what is offered, and then make your best judgement as to what suits you.
I've been using the same set of RCBS dies for decades, and they still work, so why change? I have a Redding neck size die, but seldom use it. I agree with the principle, but neck size only may not work (probably will NOT work) if the ammo is to be fired in different rifles. When I standardized on my everyday ‘06 load, my hunting partner and I each had Ruger 77 rifles, and my Elder Son later began using a Springfield 1903 sporter. Since the same loads might be exchanged amongst us, it was better - -for US - - to full length size.
I began loading 150 gr. Bullets with IMR 4895 powder back in the 1960s. I walked into Knight's Gun Shop in Fort Worth and asked Hollis Pricer what I needed to get started loading. He put the RCBS dies on the counter with a box of Remington 150 gr. bullets, some kinda primers, and a can of IMR 4895 powder. He said to load blank grains, will there be anything else, that'll be twenty-one forty, thank you sir. That load worked well in an old Mauser sporter and later in a Remington 742.
In later years, I spent a lot of time working up a load of 4064 powder for the Sierra 165 HP bullet in my then new/used Ruger. Killed a lot of game with the load, too. My friend Doug came along later and converted me to IMR 4350 powder and bulk pack Remington 165 CoreLokt PSP bullets and this became my all around plinking and practice load. We killed a lot of deer with that load, too, and I still use it with various bullets.
I still like the Sierra Game King bullets very much, but I can get along with Hornady, Speer, or the old Rems. I'll stand flat footed and admit that my old favorite Ruger 77 rifle is NOT a sub-MOA piece. It will hold 1.5 inches at 100, and this will suffice. I've shot enough small groups that I still have hope, but I need to be realistic. I DO shoot under-one-inch groups with other rifles, but I can't guarantee ‘em with the old 77R.
So - - all my handloading with the ‘06 has been with four powders: IMR 4895, 4064, and 4350, and some ReLoder 19. The vast majority of my experience has been with 150 and 165/168 bullets. Remington 9-1/2 primers work well for me in the ‘06. I have a load that works fine for me, and I'd rather do my experimentation with other cartridges.
Please keep us updated on your progress. Best of luck to you - - -
Johnny