That was the other thing, since I ordered mine with everything back in the end of Aug, I still havent received it because they are pumping out the regular rifles to keep the bills paid. they are a two to three man operation and they sell alot of other products. Ken told me recently that he would try to have it to me before X-mas. There is a 50 BMG ammo link on the Joeken website if you look around. I got some from Watsons weapons and 20 rounds of Igman yugo ball from AIM, all as an experiment to see what will work. I know one thing, avoid ammo with the heavy dome shaped machinegun primer and ammo made in the that is like 20 years or older. there is a good article about buying ammo at the FCSA website and tom at the ammuniton store can tell you some about it. the serbus were having the firing pin retention damaged from that old WWII era heavy primer AP. Except updated ones. In retrospect the Serbu would have been a better rifle for me because I like to blast.I have two rounds of that on display on my TV that I got along time ago from TNW. TNW tells you that they're ammo is more for machineguns and they dont make any promises about consistency or function in rifles. The ammo watsons sells (I got about 100 rounds of various types) looks very nice there are two tiny linear pull marks on some of the bullets. but Im not exactly going to be competing with these rounds at a special shoot. I bought this rifle for one reason making big deep holes in stuff like old appliances, cars, and junk. I might try a few long target shots (600-1000 yard range) to make sure she is sighted in right. if some of these rounds wont fit (some of the Igman yugo looks like it might not because the bullets are seated crappily canted. but thats OK because Im gettin a puller and reloader all the ammo watson sells has a lighter newer style primer and the Yugo does too. I would like to get a Hesse action and a M2 aircraft barrel to build a cut down 20" blaster ( to shoot all ammo ) as opposed to this nicer shooter.