For those of you that can't figure out why someone would glass bed a muzzleloader barrel, here is the reason. I live in Northern California, the temperature during the summer months is often over a hundred degrees, sometimes way over a hundred degrees. In the late fall, and winter, it can rain a consoderable amount, bringing the humidity way up, this, radical difference in the temperature, and going from bone dry to very humid, can cause stocks to swell,and move, a lot. Glass bedding puts a moisture proof barrier between the barrel and the wood. Now with better wood finishes, and sealers, it's not such a problem. But, not so many years ago it was a real problem.
Hungry Horse