Here are a few Ballistic Coefficient I calculated with the velocity and ballistic coefficient routines that are in development:
Projectile Ballistic Coefficient Muzzle Velocity
Golfball 0.0961 60.5
Tennis Ball (empty) 0.0295 100
Fox Steel Balls 0.2405 808
Tennis Ball (Concrete filled) 0.2633 215
8 oz PopCan (Concrete filled) 0.0970 200
12 oz PopCan (Concrete filled) 0.1289 187