That is an interesting topic. A friend of mine gave me a Husqvarna 146 in 9,3x57 a few years ago. It had two cosmetic problems. The bolt was bend like a dog leg but you could still not use the rifle with a scope and the receiver head had a few too much holes. After having plugged and welded two of the holes I made a special base out of a blank and used the remaining two holes for a swing mount. The bolt was cut and a new one was welded to the bolt body. The barrel looked like new so I was keen to see the performance.

Forming usable cases from 8x57 is not easy with this gun as I have a very tight chamber. I have to use a shortend shellholder in order to be able to set back the shoulder a few thousands more than the regular one allow. The case neck material is too thick so I either have to ream the inside of the neck out or have to turn the wall thickness down. I have slugged the barrel and it is very tight also as it measures .364”.

As I have experience with a few 9,3x62 and a 9,3x64 rifle I have plenty of bullets available. All in all I tried 6 different powders and 5 different bullet weights so far.
My rifle only prefers heavy bullets and anything lighter than 285 grains responds in decreased accuracy.
95 grs Speer (Markarov bullet, groups the size of my thumbnail in the 9,3x62) 6 inches and up
193 grs S&B (the 9,3x72Rbullet) 4 inches and up
231 factory Norma cartridge (full patch bullet) 3,5 inch and up
255 grs Geco 2,5 - 3 inch
270 grs Speer bullet 2,5 - 3 inch
286 grs S&B bullet 1,5 - 2 inch
285 grs Privi bullet 1 - 2 inch

Robert