A 360 DW is a shortened .357 max....or a lengthened .357 mag. I have no clue where you'd get laoding data from but if it were me I'd take that bit of info. and start from there. You could also contact somebody like David White about punching it out to a 'max', more data, more power and more available brass.
Curious if you have correct headstamped brass and where you got it. I had a .357 max carbine TC for a while....21" full bull SS. With 180 gr. Hornady SSP bullets and a case full of AA1680 I would get 2100 FPS. Just for reference.
Load data for the .360 Dan Wesson can be found at www.handloads.com. If you are considering rechambering for the .357 Maximum, I suggest talking to Mike Bellm at www.bellmtcs.com about his chamber design first.