Well, I think that "premium" is going to mean different things to different people. Some folk are going think that their grand daddy's old Savage lever action is the only rifle a man will ever need, other people will think a premium rifle is one you have to save up all year to buy. Other people think of premium as being what they put in the fuel tank of their car.
For me, I'd say a premium hunting rifle has the following qualities, relying on the supposition that "hunting" involves more than lying on a futon at one end of a cut line waiting for something to walk into the line of fire:
-Able to be comfortably carried as long as necessary. A 30lb benchrest rifle might be able to pick which ventricle to hit five miles out, but you sure aren't going to want to carry it all that distance.
-Does not need to be upgraded to perform any reasonable function. By this I mean you should not have to go out and upgrade the trigger and sights and change the stock.
-Does not inconvenience the user in the pursuit of it's intended purpose. This is a big one, but at the same time it is the most ephemeral. Sure it might have the best craftsmanship in the world, but if you have to carry an umbrella to keep it dry, or cancel hunts and backtrack around rivers, it's not premium. If you need to carry a gunsmithing kit with you at all times, and you need to use a microscope to inspect for dirt and fouling it's not a premium hunting rifle.
-Excels at the purpose for which it was designed. If the gun fails in the reasonable performance of it's intended use, it's not premium. Some manufacturers have great warranties because that's the only way they keep customers, others have great warranties because they're confident their products will not fail.
-Function must be at least comparable to form. If it is only premium because it has unicorn horn inlaid grips and was carved from Yggdrasil by blind virgins during an eclipse, it's not premium. Just the same as how a 2x4 duct taped to a 100 year old barreled action might be the most functional and reliable gun ever, it's not premium.
You might have noticed I left it fairly open ended, that's intentional.
A well-made .22 that costs $700 might be fully as equal a premium rifle as a custom chambered rifle that costs $10,000 and shoots bullets that cost $20 each. Premium is not a dollar value, premium is a combination of many factors. Some guns cost $10,000, other guns are worth $10,000. There's a difference.