I'm always gonna be the guy asking for this caliber but... 5.45x39! If there's enough interest for this maybe you can start offering the Wolf ammo in cheaper 200 round packs and 750 round cases. Way I see it is if you do a limited run of the barrels and get more ammo in then people can buy both from you at the same time. Mind you you'll have to get bolts made as well or bring them in from someone in the states like Ballistic Precision. Of course at that point if you start bringing in stuff from Ballistic Precision I'll take a 5.45x39 barrel from them as well!