Hi,
First off, I needed to clean the glasses, since I didn't notice what cartridge is being loaded! Ok, now that I see it's the .357 Mag, I can't offer any hands on experience. In metallic cartridges I've only loaded it with lead so far, in .38 Spl, where it behaves much like Unique, though much cleaner.
I was introduced to Universal for 20 ga shotshell use when it first came out, and the guys shooting autoloaders loved it because of that clean burning quality. For shotshell use it's a great powder. And for most uses, it's gained a lot of converts from Unique, which says something about us die hards who grew up on Unique and still like it for its versatility. Universal's close in that department, too: Hodgdon's website shows 158 gr lead in loadings from warm .38 Spl to full .357 Mag level. They only show the XTP bullet for jacketed,though, so reference to a couple of the books is probably the best advice.
Betcha like it!
Rick C