What type of B & C stock? I found that the problem with my B&C (medalist) was not a problem with the stock itself but instead with the recoil lug on my rifle. My lug was not warped but when I pulled it off I found that there was something stuck in the void for the pin on the recoil lug. when I removed this the barrel was centered in the barrel channel. If it is not problem with the recoil lug then you could try to remove material from the tang area to free float it or you could sand out the barrel channel to free float the barrel.