In the end, it's as simple as which definition to "overbore" do you like.
presented by one of the members of this forum in an article written many years ago. He characterizes overbore in terms of thermal efficiency. If one assumes a certain peak pressure, barrel length, and bullet SD, the efficiency comes down to expansion ratio, which in turn comes down to the relative case capacity. He comes up with the same number as the fellow who uses relative case capacity to try to characterize a barrel burner.
Now we have three definitions: barrel burner, inefficient, and uselessly large. Take your pick.
A google search will find that
this topic has been discussed before on these forums (of course). For what it's worth, Ken Howell's definition is there, and that's the one I've been using. For him, the definition is best used with respect to a specific powder.
