many thanks to larcher who help me to aquire the ATE ammo box
I WILL NOT FORGET THIS

so now I can answer the question I had when seeing this rifle the first time in my life: what ammo was it made for?

the 10,75 ATE on Mas 36 clip

headstamp is ATE 10,75x68

when open the box I had the biggest surprise, what was looking as full metall jacket on pics is in fact a hollow point bullet

ATE hollow point, DWM flat point and Kynoch round nose

20 years ago now I talked with the ex chief-ballistician of the Spreewerke Lübben, an east german cold war military ammo arsenal making mainly 7,62x39. He told me they had to made some lots of 7,62 hunting ammo in the 80s but with their highly specialised tools and machines it was not possible to made softpoint bullets. they could make full metall jackets of all kinds with this but softpoints were not possible. so they did the same like MWK another east german arsenal when making 8x57 IS/IRS hunting ammo. they close the jacket over the bullet base much as possible and turn the tip of the jacket on a lathe. something that work very well with the machinery. so I understand the remarkable bullet design of this softpoints.
ATE was a similar military arsenal and had probably the same problem when making the 10,75x68. they could not make softpoint bullets but full metall jackets and hollow points by drilling the FMJ.
looks suitable for big cats what was maybe the biggest problem for game and forrest departments after the long years of WW 2 when the big cats could breed in peace.

10,75 ATE hollow point and MWK 8x57IS soft point
notice the cut of jacket of the 8x57

think I need now a box of DWM, RWS, S&B and PS also
damned collecting, you will never finish