well besides accuracy I'm actually more concerned with reliability. I never have issues with the standard lawman 124gr 9mm
it always goes bang and hits in the general direction where I'm shooting LOL!
Ran some of the 147gn clean fire through a couple different guns, it was perfectly reliable and accurate. I can't really say if it's cleaner than other ammo without doing some kind of direct comparison.
This isn't relevant to your query, but I recently reloaded five boxes of 9mm Makarov, mostly "Red Army" brass. I don't know what primers they use, but there was virtually no trace of residue in the primer pockets; cleanest I've ever come across. There was marginal powder residue inside of the case.