I had thought of it, but had never done it. Mose did it. Here are his descriptive words:
" I took a random sample of 20 an got an average of 421.25gr. ready to go down the barrel. It would be nice if you can recover a couple to see how the GC took to the grooves. Also I cut the Tin to 1.25% and dropped them onto a towel. They tested Saeco a weak 4 / just shy of 7 Brinell hardness."
Those three are the only ones I got to shoot and haven' t been back. Afraid I couldn' t recover any of them due to the backstop materials (dirt, rock, brick). Have no doubt they will perform well on game though. Just have to get him to make me some more.
Dan at Mountain Molds was a little disappointed.

He suggested my scope must have been loose because they should have been in one ragged hole. He may well be right (about the hole, not the scope). He really was NOT disappointed.
One thing I' ve been thinking on is that GC' d bullets usually cut clean holes in paper. The lighter ones he sent did just that. These cut normal conical holes. Wondering if the GC didn' t slip off somewhere along the way??? Surely not.