I hope so J.
Mik and John at HPS have suggested I should get quite a lot of millage out of the barrel as long as I stick to N140 ONO.
A lot of really competitive F/TR shots are using the N5** powders, but the double base powders do seem to burn out barrels quicker, although they see barrels as a consumeable...
If you are at that end of the sport I guess they are
Dolphin do all sorts, not just new builds. Mik was on abour re-barrelling his L1A1