I don't own one but going by the ballistic charts, what i've read in other forum sites, read here, and from owning a 270WSM (very similar)here's a couple things.
Yes you should be able to shoot Bergers. I load my 270WSM all the way out to very near the lands and my 140 gr accubond is so long, it looks like the bullet is ready to fall out of the case. Mine though, still fits in the short action magazine so you should not have much trouble, maybe not all the way out to the lands, loading VLD's.
You would have a better bullet selection, especially heavy longer bullets, over the .277 cartridge although the .277 is getting better.
The Rub, I don't believe you'll find the ammo at a lot of places so you had best be a reloader or plan to become one. Some say the cartridge will be discontinued in some guns because of it not being able to beat out it's main competitors, the 7mm mag and more recently, the .280AI.
Even so, I like stuff that not everybody has and still think it would be a great cartridge for long range shooting, hunting critters up to and including elk, or a custom build project. Good luck with it!
Joey