have a friend with a cape gun that has one bbl in 16 ga and the other in 6.5x70r. anybody know much about the 6.5x70r??

It´s an older rimmed round for combinated guns.
From 1911-12, made in Suhl by Alfred Ungewitter. Bullet diameter is .257" and the max. pressure ~2500bar CIP. With an 117grs bullet you can get velocities between 2000f/s and 2250f/s. It´s an typical pencil-round.
http://wertgarner.at/ws/fronte...php?arId=RWS5670R15o


Martin

It's a good caliber for relining older corroded "big" bore guns (9.3-11mm) as it has a slim case compared to the bore.
Greg

I believe you can form cases from the newer 6X70R brass, made by Norma. Hard to come by, I understand from friends in Germany, where it has been introduced as a low pressure insert barrel cartridge.