To the short-necked complaints I hear on the .300 Win Mag, I say, "Pish and Tosh!" (you really ought to try this, too; it just feel fun to say, on occasion....) My .300 Win Mag, and all of the others that I have handled or know of among my friends, are exceptionally accurate rifles. Inherently, the accuracy problem that supposedly is going to rear its ugly head just doesn't happen. I've even been experimenting lately with the 180's loaded WAY out of the case, extending COAL by something like .15" or more, and no problems with accuracy (didn't improve it, either, though: I was trying to shorten the free-bore).
That said, however, it is certainly a fact that the Norma Magnum is (was) a great cartridge with no flaws beyond its scarcity on the shelves, the tiny selection of loads and, of course the silly belt, that my .300 Win Mag shares with it.
If you have a quantity of the brass for it, and reload anyway, I'd say go for it. If you don't reload, and don't plan to, I'd say give it a miss. There are great advantages to being in the mainstream on things like rifle cartridges. I know that, although I hunt with my own ammo and, in fact, my rifle is a "Factory Virgin" (has NEVER fired a round of factory-loaded ammo), I can walk into any Wal Mart or Gibson's or gun store and walk out with a box of .300 Win Mag 180 grain cartridges by a reputable company.
The .308 Norma suffered from bad timing.
Regards,
L.P.