The .303 can legitimately be thought of as the "British '06" -- and rightly so. As such, it has probably been necked up, down and sideways, blown out, cut down, reformed and probably baptized to everything a gun nut can imagine.

Most remain unheralded, but you can bet that if you can think of it, so has somebody else. And that other guy tried it.

Cleverly disguised as a responsible adult.