Winchester,Remington,Federal,Prvi Partizan,Hornady and Yugoslavian Surplus are about your only options for non-magnetic X39 ammo unless you reload.
The Yugo is the only non magnetic bulk ammo available,all the others I mentioned are sold in 20 rd. boxes the Prvi is the cheapest usually less that $10 per 20 and it's reloadable as well. Hornady sells there X39 SST steel case ammo in 50 rd. boxes for about $32 on average.
All your Russian/Chinese X39 ammo will have a bi-metal steel jacketed bullet with a gliding copper jacket. Most of the Russian ammo will have lead core bullet the Chinese can have either lead or mild steel core. The Wolf Yellow box ammo you mentioned is no longer mfg. but you run into a box or two ever so often.
Last edited by res45; 06-26-2012 at 04:20 AM.