This is more great info! Thanks for contributing. It is all useful and the comments on the .65 inch balls not bouncing effectively match what I expected. The smaller rounds have many times less kinetic energy, plus lead deforms easily tranferring more energy to the ground per strike, and of course a smaller ball is easier to stop with a rock, some dirt, a bit of tree limb, etc.

I would expect 1.5" balls to have a fair chance of ripping through an extremity and hitting anyone immediately behind as well.