My BP works perfect with BH 209. Cleaning out the BP happens just as bad with T7, because it's caused from the primer. Not the powder.
You might say you don't get a crud ring from T7. That makes you the only one in the world. T7 even has it's own primer to help the crud ring. Which doesn't really work.
Too many years of swabbing between shots to use anything but BH 209 for me.
Price is a moot point for a hunter.
I shoot nothing but real black in sideloacks. As it should be.