8x60 is Rear caliber to find ammo. 8x57 is nearly ever ammo producer list but 8x60 find only from RWS.
You can find reloading data for 8x57 JS from Norma homepage: http://www.norma.cc/sortimentladd.asp?Kaliber=8x57%20JS&Lang=2
It's suits for 8x60S as marseille said. There is several good loads for Hornady and Swift bullets
Good hunt.