Dear Mr. Moosemind,
dear John,

I have access to cartridge cases (new/not fired) in private stock:
caliber 6 x 70 R from the manufacturer Hülsen Horneber (stamped HH).

Some measurements (caliper)

length: 69,8 mm
outer dia (case mouth): 6,85 mm
inner dia (case mouth): 6,1 mm
rim dia.: 10,5 mm
rim height: 1,45 mm

I shoot the 6x70R in an new barrel in a Rigby single shot break top hammer rifle.
The rifle was made by master gunsmith Mr. Karl-Heinz Hirschle in Blaubeuren/Ulm Bavaria.
The rifle shoots very good (less than 30mm / 5 shots at 100 meters, with a 5 power scope) using the 90grs Nosler Ballistic Tip bullet.

If interested (please for private use only, not for selling) please send me a PM.

best regards
Rolf

PS: I sent last year to a colleague of the NE-forum cases in 5,6x61 vom Hofe, the parcel from Germany did not arrive in USA at the intended recipient.
If you have any ideas how to avoid vanishing parcels without an expensive fee, please let me know!