I have somewhat different experiences than those listed above for 700-X. As stated, it is a flake-type powder.
I use a RCBS Uniflow powder dispenser. At first, I had difficulty with metering. And bridging was a problem with low charges like in the 380.
However, I came to realize that I was using the large volume cylinder in the Uniflow. When I bought my Uniflow, the package came with both large and small volume cylinders unlike today.
When I switched cylinders to the small volume one, metering became much more consistent and no more bridging even with charges as low as 2.7 grains (which is my 380 charge).
So, for me, 700-X is my go-to small pistol powder. I use it for all small pistols that I reload: 380, 9MM, 38SPL, 45acp. Hogdgon also has a 700-X load for 357 which, of course, is not a full charged magnum load as the powder is much too fast for that. But, it's a good light plinking load out of the 357.
Also, availability of 700-X tends to be a plus.
My experiences, at least...
Bayou