I had some Juinor "Olympic" wasnt it? 5,000 rds of inconsistant junk. Worked fine in semis and bolts but stringed up and down about 6 inches at 100 feet, so you never knw where to hold. I think I threw about 4,500 rds in the dump, even the kids didnt like it.
As for aluminum cases, I havent had good luck with extraction in CCI's small pistol rounds, so I dont use em either.
Steel cased 8mm Romainian works well in the K98k, and steel Wolf .223, steel Czeck 7.62X54r and steel 7.62X39 are all well known as accurate and reliable in most all rifles.