You're right, Pat. Cast bullet hardness-or lack of it is important. My "tester" is mounted to the end of my finger/thumb. If it takes good/moderate pressure to scratch the base of a bullet, then it is just right.
For those out there that buy cast bullets-Brad, at Missouri Bullets, is one of the best at providing the proper BNL bullets for a fair price.
I have ordered/shot more than a few of Brad's 500 packs of bullets, and can say that he and his family run a great operation and have SUPER fast shipping.
Google up: Missouri Bullet Company and check them out..Bill..