I would go with the McMillan, also check out H.S. Precision, you cant go wrong with either. Bell & Carlsons are nice, that is what I have on my Ruger 280, no complaints it works great but it is not the stock that either of the ones i mentioned above. I dont know if they still do or not but I have a Rem. 700 Sendero 300 Ultra Mag., one of the first ones made that came from Rem. custom shop, it came with a factory H.S. Precision stock, top quality for sure.

I'm leaning more towards the Mcmillian because of the larger selection,and also the quality. I haven't counted out Manners though.
Does anyone know if either one of these companies will mount the barrel and action in the stock?

not even comptiition,get the mcmillian and dont look back. B&C dont even come close,garbage stocks.mho