erich is correct, as usual.
It's probably the standard 9,3X72R that takes .364 193 grain bullets. It's akin to the 35 Remington with a 200gr bullet.
It was the common gamekeepers' round 100 years ago. I've thumped a couple of mulie does with the round, one at 65 yds and one at 120 yds, both DRT. One was shot with a nice old back-action drilling, and the other with a slim & trim cape gun. The drilling had a vintage Voightlander 2.5X scope in claws, appropriate for the X72R.
If you are getting one or have one there is some ammo still available on the internet.
https://www.ammunitiontogo.com/index.php/cName/rifle-ammo-93x72rhttps://gun.deals/category/ammo?caliber=2866http://www.selwayarmory.com/shop-by-category/rifle-ammunition/93x72r.htmlHawk makes a very good 200gr .365 bullet that is about ideal for the round. Dies are now made of unobtanium. I wish I hadn't given away my extra set.
41 grains of IMR 30-31 was my starter load and usually my ending load...very accurate. DO YOUR OWN DATA RESEARCH!!
