The .50 shoot is ours, we get together there on the 3rd Sunday of every month. There's a gun store called ARM USA that puts on a .50 shoot once or twice a year, the owner comes out to our shoots from time to time.
IK 88 is Yugo, Keith Pagel from FCSA (Fifty Caliber Shooters Assoc.) had it tested and it came back as slightly corrosive. The other Yugo IK 98 that's out there is the same way. Don't worry about it, just clean it with hot soapy water when you get home.
You need the copper solvent to get rid of the copper build up in the barrel. There's alot out there with the most common being Barnes CR-10, Sweets 762, Boretech...
I agree with Lumpy, the recoil can be compared to a 12ga with magnum loads. Two guys that come out have Ferrets, one of them didn't have a good grip on his and POW! The other guy seemed to do good with his, he put about 8 shots into a 2" group at 100 yards first time out with it.