Here are a couple of Lefever crossbolt guns with "tapered bores". The first one is a Grade 5B and the second is an Optimus. Not all of the crossbolts I have measured have tapered bores, but some do. Measurements are taken at 2 inch intervals from the muzzle.





docs.google.com/document/d/1PqK3UImDCrsOrk6O_2DsovHXvaNSzliSiwaP35Y6PMk/edit?tab=t.0