Now, in this chart, the Miller bullet is about equal to the Pope style. Doesn't make sense to me. Why does it change from way down in pressure(even at higher charges) fixed, while gaining in rank to near the top with breech seating? I know powder change might, might explain it here in the H108- but it's illogical in the earlier chart, ain't it? 
I have never seen this chart, John. Not sure I've ever seen another list from a powder company that showed results for breech seated bullets. Maybe I saw it, but disregarded it because of the powder involved. Thank for digging it up, though.

Thanks for the breech seating data John! I'll have to see if I can find the same data for that (or similar) powder, so I can see what the difference might be?

edit-I found this data, which puzzles me. It shows the exact same velocity, etc. for fixed ammo? Need to look further I guess?
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John, it's not really fear that prevents me, nor was it ever likely that exactly. Unless it's that I simply don't want to risk harm to a wonderful old rifle. I have used ball powders in revolvers, but not in a cast rifle. In other types of shooting I've probably shot s--t that might have scared you, never feared it though.
Unlike you, and many other competitors, I can't just replace my barrel. Or for that matter, do I want to if I could. I like it because it's a piece of the past. 
When the subject came up- until recently when some on this list shared information on  using ball powder- I didn't know if it was a good idea. Even in a strong rifle, the barrel could be damaged with a mistake. So, I take the more certain, if stodgy, route. I don't shoot four pounds of powder in that rifle in two years. Maybe someday I'll get around to doing something different, but I'm good right now- in fact it's probably me that'll be the limiting factor here. Mr. Hudson, I'm not.
And, I'm not giving anybody advice for competing, just for getting a fun day out shooting here and there. You, and others on the competitive edge of the field can have your razor-edge loads, my antique is sufficient to itself. This isn't argumentative, just a different take on shooting than yours is.