I have some T7 pellets that I used in dad's rifle before BH209 came out, but I can't say that I really know much about it....I loaded it, shot it, sighted it in, killed a couple of deer with it, then got the Savage and since then he has hauled it to the woods 1-2 times per year, but has never fired it at an animal that I can remember.
Blackpowder is hard to get here, too. Last time I wanted a pound of it, I had to drive to Memphis, TN (lived near there at the time) and pay a high price for it. Sure, you can order it online, but shipping costs make that a no-go. Most of the stores here sell pyrodex pellets, but I've seen the corroded legacy of pyrodex enough that I want nothing to do with it.
This may be one of those cases where I end up having to just shoot whatever I can find, not necessarily what I *want*.