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I've never seen one.
If it's a full-sized 300 RUM case necked down to 6mm, and if he had a box of fired cases, the barrel may already be burned out.
The idea is to launch an extremely long bullet (with incredible sectional density and ballistic coefficient numbers) as fast as possible. Supposedly, that adds up to very high retained velocity and energy at extremely long range - and hypotehtically less wind drift, too.
The theory sounds good, but...
Bullets like that require an extremely fast rifling twist (perhaps as fast as one turn in six inches!) and that causes extremely high pressures. So they can't burn all the powder the case holds, anyway. And they can't get the velocity they wanted. And they burn out the throats in 100 shots or so.
And then they sell the gun. Hint, hint.
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