Re: Stock upgrade McMillan vs AI
I would go with a Manners T mini-chassis. I don't believe that getting 90% carbon fiber will save you much on weight, as you only get a 0.4 lb reduction; would that much really make a difference with all the other hunting gear you will carry?
The base stock weight would be 2.5 lbs, +0.62 lbs for the mini chassis, so 3 pounds total. If you have a sendero type barrel and a short action your rifle should come in under the 10 lb mark. A triad tactical stock pack (large version) will give you a nice cheek weld and put your eye on level with the scope without needing the weight of the adjustable stock hardware.
I think that this system gives a nice, all around system that you can use for target/tactical stuff and hunting.
The AI is not for me. If you're not interested in the Manners mini-chassis, then get a bedded Manners T4 or McMillan A5. These are very nice, comfortable stocks that are functional and have much more pleasing aesthetics.