I don't know that you can find out, short of some very expensive tests. The advice I got when I started asking these kinds of questions was "Don't worry about it, what do you want to do, shoot, or be a scientist?" <P>So.... I stopped worring about it and just cast straight linotype. I shot a cute little 3" group at 300 yards this past weekend from a M94 30-30 with 150's with GC's. Not bad for iron sights(peep) and out of the truck window. <P>Have fun.<P>armjr<BR><p>[This message has been edited by ARMJR (edited February 04, 2001).]