Valves,
There are different models of Bell and Carson Stocks, the cheapest model without the full length Aluminum Bedding Block costs between $150 and 170, the Medalist model with the full block is over $200.
Just put the cheapest Bell and Carson on a 1903 Springfield High Number Action made in 1918 with a Remington replacement barrel made in 1944, glas bedded it and it averages .6 tenths of an inch groups at 100 yards.
The stock with the Aluminum bedding block should be glas bedded also for best accuracy.
Nothing is magic about the Aluminum bedding block except that it makes the action are more rigid and less apt to flex with the heavy magnum calibers where it is needed.