Hi Fitz.
Where in Md are are you? I moved to Maryland from Idaho [stupid, I know] several years ago and although I am far from expert at the long range game I would be willing to help you out.
Since joining this sight a couple years ago I have managed to take a few critters past 600 yds and I regularly shoot targets beyond that.
I built a carry weight 7mm STW for my first custom and would be very comfortable shooting an elk to 800 yds in calm conditions. My cartridge and load are capable further especially at high elevations but my practice has been at 800 and less.
My goal when I started was to have the ability to shoot to 600-700 if that was the only shot that presented itself. I love the stalk and am just as happy killing my bull at 6 yards as 600. I have reached my goal but unfortunately [for my wallet] I have contracted the long range disease and my original goal now seems uninspiring.
I spend most of my trigger time behind a 260 Remington, a .223, and rimfires and I believe that precision practice with any cartridge at any distance is invaluable.
When I build a dedicated long range hunting rifle it will be a .338 on a large capacity case [RUM minimum] for all the reasons you have already heard from others.
I live in Columbia. I'm originally from Utah, so I know how you feel about moving out here.
If the brake does give me too much trouble, I'll give SSG a call and see what they are able to do.