To date, have not shot "White-Hots" nor have I gotten around to shooting Blackhorn-209. ....
However, I have used pellets in the past and I still keep coming back to loose powder. I cannot reach my optimum loads with pellets and frankly, I just don't trust them as loose is more redictable. The only "slight" advantage that I have ever seen in pellets is ease of loading but that's not a big deal, is it?
and use only Holy Black since.
You can't get more predictable than this and hardly if ever, gets old. ...
However, I will never go back to using it. .... JMHO
Be Safe !!!