Sound like nice handy rifle.

In regards to having the throat cut to allow touching the rifling, perhaps you could consider if you should arrive at a destination without your ammo or having it lost. The off the shelf ammo you may have to settle on may not chamber. If you have settled on a specific weight of bullet, matching the twist may influence the potential accuracy more than the 'jump'. As a competitor in Ftr long range, our chambers are cut with a specific reamer intended for only the one bullet used. We still prefer to keep the bullet off the lands as a bullet 'jammed' may not come out with the case if or when the rifle needs to be unloaded with alive round. Usually a rod is needed to dislodge the bullet in the throat and powder goes everywhere you do not want it.