If they made it to production they usually shot good enough for either commercial or government use. A natural selection weeding the poor shooters out so to speak. One is hardly likely to invest money in production of a cartridge that proves inaccurate in testing.
But in my own experience the .22 Magnum, and the Snider .577. The .22 Magnum's I have met have trouble getting under one inch at 50 metres, and the Sniders I have shot have difficulty getting under one foot at 25... (How accurate are .22 shorts?)
.303's have a bad name; the Lee Enfield rifles were designed to shoot the equivilent of three inch groups at 100 yards, but the cartridge itself will do anything you like in a good rifle. The rifle target clubs all up through till the '60's were all shot with .303's.
The .30/30 has also a poor reputation because of the open sighted lever actions, but the .30/30 can be a phenomenal shooter in single shots and bolt actions.
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