Per Hodgdons, Longshot works just great with their START load over 1K fps (!) and another "grain & a half to go" to their recommended MAX using a 180gr XTP... Their CFE Pistol data is no slouch, either.

The factory American Gunner load is a claimed 950 fps: Underwood's 180gr uses a Nosler JHP at a claimed 1100 fps.

I have personally had great results with 800-X in both 40 S&W & 10mm, but I still hand weigh (verify, if you prefer?) all my loads.

Cheers!

P.S. Hodgdons also has published loads for the 180gr Berrys FP if you are interested in plated bullets for range/practice work.