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Just because its a good cartridge does not guaranteed it is popular (41 magnum for example).
303 just odes not have the push over factor in the US to take off.
It doesn't do anything that the 30-06 does as well and the 30-06 has a ton of bullet choices because it was the US mainstay from pre WWI though WWII (and a bit beyond ).
There are some fine US 30 caliber cartridges that are equally low popularity.
And the one that do have a pizaza factor and lots of advertising.
Of all of them a rimmed rifle cartridge is looked at as odd (pistol caliber cartridges and the 30-30 which got entrenched aside).
Some issues with hand loaders and the old mil surplus chamber sizes and no joy there and ammo availability.
So it goes for a fine venerable round.
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