http://members.shaw.ca/cstein0/metric.htm
Here is link that defines the cartridge dimensions.

From european sporting cartridges
GPS16 11.2x65R COLLATH aka: 11 x65R, 11mm Teschner
" This cartridge appears to be interchangeable with the 11.15x65R LK Express (EXP46). While DWM case #503 appears to be the Teschner version of this calibre although no speciman with the Tesco type hs has been noted. This is the largest of the Collath calibres."

Bullet= 11.20=.4409 dia
case= 64.85=2.5531 length
rim= 13.20=.5197 dia
base= 11.90=.4685 dia
neck= 11.80=.4646 dia
from 1900-1915
RWS
DWM 503

hope this helps

m4220