>>1440563When it comes to ballistic coefficient, it is all about math. Steel balls are quite fine and do a good job for the band size required. Regardless, I will not be slinging lead pollution all over my property, fields, and forest. Steel balls just rust away.
I use 3/8"(0.375cal or 9.144mm) steel balls for hunting and 1/2" (0.50cal or 12.7mm) steel balls for target practicing.