I just bought a new Brown Precision stock. This is their position on the subject.
There's a lot of controversy in this industry about how, or even if, you need to bed a rifle's action to a stock to make it perform.
After building thousands of custom benchrest and hunting rifles, performing exhaustive range and field testing and experimenting with virtually every one of the bedding "theories" out there over the past twenty-five years, we have concluded that mating the action to the stock is the only way to achieve absolute top accuracy and consistency from a rifle. Period.
And because Brown Precision stocks are constructed with solid epoxy in the action area for strength and rigidity, only simple glass bedding around the action is required to achieve maximum performance - no pillars or permanent glue-ins.