Originally Posted by Dart
most don't allow silica though. Something that can crack glass should not be shot at humans.
I can shatter a glass bottle with a .30 styrene... I can crack a window at 10 feet with .28 from my M4 sub 400 FPS... By your reasoning, we shouldn't be shooting airsoft at eachother?
My point is, read the many discussions on Silica... they cause the same amount of damage to skin, teeth, plastic equipment as regular bb's do. The only difference is they travel right through glass since they are made of it.
To answer the OP: A lot of Paintball fields are moving to bio only, the ministry of environment is the protagonist behind this. Most fields limit what bb's you can use, including weights.
Some dont allow bio
Some dont allow silica
Some indoor facilities limit your weight to .20 at sub 350FPS.
If your not sure when you sign up for a game, ask the hosting player. Chances are, others are curious as well.