I have just found a write up in the German Pirsch hunting magazine from June 2016.
Brünner ZH Model numbers
301 7x57R & 12/70 60 cm barrels
302 12/70 & 12/70 66 cm barrels
303 12/70 & 12/70 76 cm barrels
304 7x57R & 12/70 60 cm barrels
305 5.6x52R & 12/70 60 cm barrels
306 5.6x52R Mag & 12/70 60 cm barrels
307 .22 Hornet & 12/70 60 cm barrels
308 7x65R & 12/70 60 cm barrels
309 8x57 IRS & 12/70 60 cm barrels
321 16/70 & 16/70 60 cm barrels
324 7x57R & 16/70 60 cm barrels
325 7x65R & 16/70 60 cm barrels
344 7x57R & 7x57R 60 cm barrels
345 7x65R & 7x65R 60 cm barrels
349 8x57 IRS & 8x57 IRS 60 cm barrels
3.4 to 3.5 kilograms
OAL 103 cms (I assume that is for the shorter barrels).
Mine is a 309 model I bought it new and have never shot it yet as it was to be for one of my daughters but she gave up on becoming a hunter.
