Here is a clam shell brake

http://www.jprifles.com/Remington700.html

Part of the idea of these is that recoil is reduced so much that bullet strike can be seen.

This is the KDF type brake Wby use that is larger than the barrel. This is a 30/378

http://www.hallowellco.com/Weatherby-Mk-V-20512-muzzle.jpg

And how they look with a barrel with sights here is a Ryan Breeding 500 Jeffery. I bet you will like this rifle.

http://www.rbbigbores.com/images/20inchm.jpg

Mike