McMillan is the way to go if you want the "Best" lightweight hunting stobck. They are also very expensive. A standard weight McMillan (30-32oz.) will run you around $475 shipped, one of the really lightweights (20-22 oz.), around $550. I've got 4 rifles in McMillan stocks and love the idea of having a very stiff rigid atock that weighs about 1/2 what a standard factory stock weighs.
The HS-Precison stock uses a much different construction method. They use a much cheaper way to build the stocks, but use an aluminum bedding block that is not needed with McMillan. They get all their strength from the aluminum bedding block. Without that they would be very weak. This does end up making a very rigid stock that shoots well. They also make for a very heavy stock (40-48 oz.)
Politics aside, if I couldn't afford a McMillan, and didn't mind the extra weight I'd just as soon have a Bell and Carlson Medalist. They use the same construction methods as the HS, are just as good in my experience and sell for just over $200 vs around $350 for the HS.
You don't mention what type of rifle, or what you plan on using it for. B&C does offer some stocks they call Lightweights for some models. Their lightweights run around 30-32oz, which ain't really all that light, but is still better than their 40oz standard weight stocks. If we are talking about a hunting rifle, or a varmit/tactical rifle would have a huge impact on my decision. For me, I'd pay the extra to save the weight on a rifle I'm carrying for miles in the mountains. On a heavy tactical rifle that were only shot at the range, I'd save the money and go with a heavier stock.