Anybody ever loaded this round?

DP use medium slow AA#7,Bluedot etc.It's as easy as any other round.

I have loaded several bottlenecked pistol cartridges except the 357 sig. 400 Corbon, 9X25 Dillon and 40 Super. Since the 357 sig headspaces on the shoulder you will need to pay a lot of attention there if handloading. As with the 9X25 Dillon I find setback to be critical for reliable ignition.

if you're shooting a Glock use the barrel as a chamber checker, otherwise get one from Wilson and use that.