Ok, longer post...
I'm sure, absolutely positive, that the 277Wolverine is a great round. It duplicates the specs of a 7mm TC/U, which has been around since Christ was a Corporal, and has a lengthy track record for both metallic silhouette and short range hunting of medium sized game. New bullets designed for the 6.8 will makes it even better. So, other than the missing. 007" of an inch, no biggie. For what you are looking for (short range critter gitter), it'll do well. I am not downplaying the cartridge itself.
It's just that it's nothing new. It's a vanity offering.
[rant]Admittedly, most 'new' cartridges since about 1963 are too.[/rant]
My concerns come from a few directions. First, any time you get into a proprietary cartridge, you are beholden to the developer. The developer will work with companies to design the reamers and loading dies, and the reamer and die manufacturers may not be willing to sell one OTC if you need another bbl, or something happens to your dies. Not really any big deal for a hunting gun, but it is a consideration. And what happens if the developer goes out of business?
This isn't meant to downplay wildcat cartridges. I loves me some wildcats, but proprietary cartridges give you the worst of all worlds.
Second, good luck trying to sell it if/when you get tired of it. Unless you find the one dude that's looking for it, you're SOL. Yes, you can re-barrel etc., but that's just more coin outta pocket.
Third, and the most compelling reason... safety. Mag and bolt interchangability sounds great on paper, but that's how shit blows up. If ammo or mags get mixed up, and it happens, you end up trying to shove a .277" bullet down a .224" bore at at pressures in the neighborhood of 58kPSI. That expensive proprietary gun will go high order in short order. No frakkin bueno.
The cost of a few new mags and a new bolt are chump change to an emergency room visit. And possibly a life altering, crippling, injury.
Your call.
Personally, I'd drop the cheddar on a 6.8, and not look back if you are wedded to the idea of using a MHR. Better(ish) performance in the game fields. Commercially loaded ammo. Established SAAMI specs. Industry support structure in place. Either way it's a 200ish yd gun.
Honestly, unless there were caliber restrictions in your locale, I, personally, would have zero issues shooting a small to medium size whitetail with a 223 70gr TSX inside 200yds. Granted, I'm not everybody. Would it be my first choice? Frak no. But if it's what I had, don't get between me and my deer blind.
On a serious note, for the cost of a new upper/bbl/mags/bolt, I'd go buy a used Rem700 in 270/30-06/308/7mm-08/etc., and kill the shit outta some critters.