Binding has a whole slew of causes
A gun machined to loose tolerances around the pin will obviously accept more grit that one machined to close tolerances. If the machining is too loose, the cylyinder pin can bend slightly from the forces at work under pressure. Mostly for these reasons, binding seems to differ from gun to gun.
Binding is also affected by the texture of the metal inside the cylinder and on the surface of the pin as opposed to fouling or the holding of fouling if the surface is rough or rusty. Evern a seriously smooth and polished surface might not retain it's lubricant well in conditions like these.
Binding is also affected by using lubricants that could be high-grit from the production facility.
Binding is also affected by using lubricants that attract and hold grit because they are too thick or sticky.
Binding is also affected by using lubricants that may crystalize when coming into contact with combustion or embers or or very hot gases.
Binding can be caused by micro bits of patch fiber, by lead oxides, etc, etc, etc.
Binding really doesnt change by changing powders. All powders burn and produce grit or foul, be they pyrodex or black. Pyro cleans up easier than black, but it still makes residues just as black does.
Binding need not be a problem. As has been said, wipe the cylynder pin clean. Keep a small brush on a small rod handy to swish through the cylinder, followed by a cleaning patch. Then apply a light coat of canola oil or if you prefer, a ligt cooking spray. Put your cylinder back in and fire your weapon. You will notice a difference.