Everybody always says Power Pistol has a lot of flash...I've never found it to be a problem myself and I have done plenty of low light shooting...it does have a bit of flash, but nothing extraordinary.
It meters great in my el cheapo RCBS Uniflow...never off by more than .2, but I'm a perfectionist when it comes to reloading...I weigh every charge (too many years of long range shooting I guess)
I like Power Pistol because it can push heavy bullets fast...real fast...and it fills the case, its the most accurate powder I've tried that can reach the speeds I want with 230 XTP's and Gold Dots out of a 4.25 inch barrel...it does however have a pronounced "bang" and some recoil due to the load density.