I bed every rifle I build but NOT for accuracy.
We are talking black powder here, not a Magnum Weatherby. A properly inlet tang will give you more accuracy than bedding a stock.
What bedding will do is strengthen the weakest potential areas of the rifle - namely the sides of the barrel channel and the web.
I also coat the trigger inlet, lock inlet and inside of the patchbox (if applicable).
I use unthickened marine epoxy (usually West System) and just keep (painting) it on until the wood won't take any more.
If the barrel inlet is a little "sloppy" in places, then I will thicken the epoxy with a little silica for the final coat, wax the barrel and then fasten it in until the epoxy is set.
So I say, if you are doing it to strengthen the build, absolutely go for it. If you are doing it because you think you will improve accuracy - save you time and money (which would be better served with an extra pound of powder and a box of balls - practice would do more for you impact point than a bedded barrel)