OKH changed their cartridge to .338 when .333 bullets became difficult to obtain, as EK wrote several times.
I think that a .338 on the H&H case, sans "blow out" as Powell, et. al., did and Weatherby popularized is a rather poor idea and the Winchester folks got it right in the late '50s, except they should have followed Newton's original concept a la .375 Ruger.
