Reloading .303 British : 303 British Brass Options?

Any barrel, with any powder will eventually wear out.

It was pretty much Voodoo when exactly under what circumstances until the arrival of "poor man budget" available bore-scopes.

Now we can actually see what was previously "shiny, it must be clean, & so good. Its a really humbling experience the first few times. Bores that hone like a mirror have gouges & other stuff in them & seeing them at fairly high magnification is a learning experience!