No offence mate It just seems like Every American has a .30-06 or learner to shoot with one .
For many years Australian s used surplus .303 rifles and ammunition as returned servicemen or from military surplus, the .303 cartridge was wildcatted to form a few variants. The most common may be the .303-25 often called the 30-25
Yes the .303 was used in both world wars before later adopting the .7.62 NATO round and rifles/machine guns chambered to suit (Lithgow L1A1 SLR/M60 machine gun). Those would have been on the Korean and Vietnam wars before adopting the Austeyr in .5.56nato for the troops.
There might be an old bloke here who can elaborate on the .303 etc
Not knocking the .30-06 Its here, it's used by hunters but it's not that common. The .308 is widely used.