I'm impressed that it works so well and
that TC would send it to you.
I couldn't figure out why the industry ever adopted the 209 primer since it was never really perfected at the time. But now with the development of the new Blackhorn 209 powder, only 209 primers are recommended for igniting it, and even then there's problems firing it off with some nipple and beech plug designs because it will hang fire.
A duplex load might solve that.
Does the brass get dirty enough to require some cleaning?
I still prefer to shoot an early style inline that uses an 11 cap.