Drew;
I have spoken with someone on these Lefever chokes, don't recall now if it was Daryl or perhaps Bob Noble. While it was true the bores were not totally cylinder all the way the majority of the restriction was still at the muzzle. The bores themselves did have some taper in them but not uniform. The dimensions which were given to me seemed as much as if it were just uncorrect reamer wear as any actual intentional thing. I have several Lefevers from an early side pivot up to an Ithaca assembled one & none show any significant taper to the bores, all have the taper choke at the muzzle. No parallel with full choke running up to around 4" in length.
I do not have a gun so bored to prove it, but am of the opinion that a barrel with a constant taper from chamber to muzzle would shoot pretty much cylinder as a cylinder, rather than as a choked gun.
