The 147 works great at 800-830fps with Red Dot and HS-6 for me. Unique and HS-6 will match factory fps and accuracy.
As for the compressed ball powder, thing.....
Back in 1977 the was "the complete book of practical handloading" by John Wootters.
I believe, some where in that book, the dangers of compressed loads of ball powder can be dangerous, is mentioned.
I am too old to go through the whole book to find it, if this is the book........... but I did read about this in some article, some where, in my readings, over the years.
Generally, ball powders are at their maximum, way before they get to a compressed loading. None of my 9mm or 38 special loads come close to getting near my bullets.
Now SR4756 and IMR4227 will max out in some of my 9mm loads tested but they are so slow that they only reach standard loadings, for me, if lucky..........
but w231, CFE and HS-6 are still down there, some where, in the case, with my loadings.