in the name of our science I contact the seller about the drilling. knowing that it dont comes so good if trying to look super clever in such an investigation all was done very polite. I was trying to tell him my doubt about the correct cartridge designation. he send me a mail that the 10,75x65R Collath realy exist, its very clearly described in "Cartridges of the World" and he have some original cartridges. at all he was so convinced from his truth you had buy the story without a gun from him. send him fact's, show him that the author of CotW never ever had seen such a round and that the very bad illustration for this cartridge hide

it was stolen with the measurments from Datig "Cartridges for Collector's"

then I ask for pics fom his cartridges with some measurments.

as you may believe, he dont write me back and so I am not ably to prove the existence of the super rare 10,75x65R Collath cartridge!

you can call it negativ proof