I also have 2 Mausers chambered in 9.3×62mm. I like them both, but the Oberndorf with 22" bl. is my favourite.
One note, please do not use the 270gr. Speer in this ctg. It is too "soft" a bullet for game larger than perhaps 100 pounds. I will not use this bullet even for our NA deer.
If bone is hit, the bullet simply comes apart into tiny pieces. This was my experience with an impact speed of approx. 1,800fps, a 200 yard shot with initial vel of 2,300fps.
Sould note here that the 1905 ballistics on the 9.3×62 was a 286gr. soft or solid at 2,175fps and it wasn't until 1923 that the ballistics were improved to 2,320fps or thereabouts. This, according to John Taylor, I think.