you can find 762x39 igman or privi partisan ammo
at can tire or most gun stores .its soft tip hunting ammo and is about 16 buc a box i got some last nite at sportsmans den in Red deer .
they also have boxes or crates of the norinco ball ammo
for $5.50 for 20 rds
I bought my 858
in Red Deer a couple of years ago its an awesome bang stick suprisingly accurate even with me shooting it .
never had any faults or failures , just remember to pour boiling water in it after shooting and prior to cleaning , to remove the salts (from primer)
as the military ball ammo is corrosive , the modern hunting stuff isnt .