So I installed gas checks on about 100 of my cast .223 boolits today using a Lee .225 sizer/luber. As I was visually inspecting the first 30 or so I noticed copper flecks stuck in the Alox lube. I'm thinking this can't be good. So I put the boolits in a tray with some mineral spirits and swish them around some. The copper shavings that came off those boolits could mess up a clean barrel pretty fast. I polished the die some and that helped on the next 2 dozen but still getting some shavings. Is this normal??