Pitch targets are tar pitch and pulverized lime stone. Bio targets are Sulphur based.
I could never figure out when oil prices went up a couple of years ago, why Winchester didn't price thier bio targets lower than the pitch targets. They would own the target market if they did.
Sulphur is a by product of oil refining and coal scrubbing. It is abundant enough that they will use it to make dry wall and such.
Everyone seems to think that the bio targets hurt everything from machines to the grass, but, you can lime the ground and sweeten it to take care of the grass and just do good maintenance on the machines and there is no problem there either.
Just a thought, cheaper targets and biodegradable too.
We tried them and they broke down in about 3 months and didn't kill our grass.