I wound up with a can full of SOFT lead slugs about 0.350 inch in dia.
I ran them thru my 40 cal swagging dies and made a hollow point 40 cal slug about 180g.
I then powder coated them, sized and gave to a friend. He loaded them into his 10mm.
When he fired them he said they DID NOT lead his barrel and were as accurate as any other ones.
So in my opinion fit is king and powder coat lets you use soft lead as slugs.

Lafaun