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If you want a brake go with a Terminator T2 or T3. They are made from titanium and reduce recoil extremely well.
Fluting the bolt will save an ounce or two and is poor return for the cost, but if you want to do it, go with Long Rifles Inc as their work is superb and it costs only $45:
For ammo, I used Hornady 178 grain A-Max home loads when I had a .30-06. I prefer heavier projectiles in that chambering as they hit hard and have better BC.
I'd go with the 20 MOA rail as there are no negatives to doing so, but it gives you additional adjustment if you want to shoot at longer range.
