Relining-Reboring-MuzzleBrake

For the 5.7x28mm Handi project, another option would be to start with a 17HM2 or 17 HMR barrel and re-bore to .22 caliber then rechamber to 5.7x28mm

Relining-Reboring-MuzzleBrake: "Reboring and Relining
Reboring your existing rifle barrel is an economical way to get a high quality barrel. The only acceptable process of re-rifling a barrel is to cut the rifling, button rifling will not work on tapered barrels. Cut rifling has been around for years and is a proven method of producing highly accurate barrels.

We will rebore rifle barrels that are 18 inches or longer. Minimum muzzle diameter for rebores up to .375 is .550. We do not rebore double rifles."