nice looking rifles for sure...
The Burris Signature rings allow you to use their "eccentrics" as they call them. The plastic inserts which sort of work like ball joints inside the metal rings don't scratch the scope tube, and Burris claims they hold tighter than standard steel rings--and they might, at that.
Anyway, you can get a standard Leupold/Redfield style ring/base set up, get the Burris Signature rings, and the eccentric kit, which contains +/-20, 10, and 5 MOA offsets. With those, you can drop the front of the scope and raise the back. I've actually got 30 MOA of lift on the back of my Weaver Grand Slam on the Machiara concept rifle.
What that does is two things: It lets you dial all the way to 1200 yards in this case, and it also just happens to prevent the elevation turret from being dialed one rev too low, causing you to lose your 100 yard zero. If you go with a scope with only 45 to 50 MOA total elevation (a one inch tube), it'll work out about right in the 20 to 30 MOA offset rings, allowing you to reach a 100 yard zero, but not letting you go one rev below your 100 yard zero. In the case of my rifle, it'll go 7 MOA below the 100 yard zero... and I'm out of travel. I just bring the turret back up to the zero mark, and I'm there... The Grand Slam's micro-trac system doesn't mind working off the bottom of the elevation limit... I've never had a problem at all, and have set up two other rifles this same way.
Here's a link, with some photos of the GS on my .243 long range gun...
Practical Riflery Forums... techniques and equipment of the practical rifleman... :: View topic - Dialing for long range shots on a budget...
If you ever go with a Grand Slam, the turret mod I show is pretty essential in my opinion... it works out great.
By the way... lots of guys think the Redfield style base is too weak to be relied on... but I've seen an awful lot of guys mount 2 pound scopes in a pound of Badger rings and bases... and it's all held to the receiver with the same three teenie-weenie screws that the Redfield base is held on with... so you gotta go figure.
Dan