Just wondering outloud here. Wonder if a feller had a chamber tight enough to have the case snug up on a bore diameter boolit ... Then add a paper patched boolit up to the bore diameter ... Then add the prospect of doing all this in a .454 45 Colt chamber (tight as mentioned first off).
Now lets say we do all this in a single shot rifle ... Say a TC Encore ... And breech seat the boolit in the rifling ... Blackpowder style only use smokeless powder.
Forgot to add that this boolit would have a hollow base to expand very quickly into the groove's and seal the barrel pretty fast.
What do you think about this fairly short range marriage? Think there be any merit or a colosal waste of time n effort?