I am on the BOD of a gun club with a fairly modern 20 port, 75 foot indoor range. We don't allow BP inside. It is simply very difficult to move enough air to handle to BP.
In a properly designed range the air should move past the shooter and continue down range to move bad stuff from the shooting area as efficiently as possible. Even a mild windstorm takes a while to move that much air. Our range volume is about 40,000 feet. To move 40,000 feet of air in a short amount of time takes a heck of a big blower, and the targets would be waving all over the place.
On top of that, in the winter, 100% of the air from the furnace gets dumped right out the back. We tried HEP filters and recirculation and the expensive filters needed changing twice a month... so much for that. So, to move that much air would consume a heck of a lot more heating oil.
So, it isn't that range operators don't like BP shooters, it is just that BP was never designed for recreational indoor use.
Rick