Originally Posted by
gundoc
Sleeving was a common enough practice in NZ, starting in the 1920's with English tubes by A G Parker (Parkerifling) but after WW2 the demand had dropped off because the smokeless ammunition had been in use for many years and rusted out barrels were no longer a problem. I started doing it in the 1970's using US tubes from Brownel'ls but haven't done one in the last 10 years. As Friwi has mentioned, only low power rounds can be sleeved (rimfires and some of the old black powder rounds). Rebarreling is the only course of action for your old .303. New barrels are available at a price but good used barrels are still turning up at far lower prices (I still have a couple).