The more I thought it over, the more I went over to the hacksaw/file route.
I will measure for taper, Thanks!
I plan to go a little longer than 19" to be sure to have room to recut if necessary to adjust patterns.
Ammo will be heavy field loads and mainly Buckshot (4- 00).
The gun is a Westernfield/Mossberg with a long barrel which is why I wanna cut it...