When it first hit the market, I viewed it as a gimmick.
Copper fowling at handgun velocities just isn't the thing it can be in a rifle.
But, lo and behold, the stuff makes some serious numbers in a lot of handgun cartridges. so a few 8 pounders followed me home.
I use it for less than magnum loads in 357 and 44, it's the standard fuel in 45 auto, 9mm and 38 special and even finds use in 400 Corbon.
It seems to do alright where I would have used Unique or power pistol.

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it just needs more voltage