Flip go to Alliant Powders .com they have data on RE15 and the 7-30 waters.
The data folowing is from their free reloading guide
All Are Maximum Loads and the chamber pressure data for the 7X30 Waters is in copper units of pressure.
Hornady 120 Sp. Pt. Fed.210 prime ,2.64" Minimum overall length, Fed. brass, 24" bbl,36.3grs Re 15 @ 2,725 fps,39,000CUP!
Hornady 139 F.P. Fed 210, 2.65" minimum O.A.L.,Fed. brass, 24"bbl.34.7gr RE15, @2450 fps, 38,800 CUP ! but this is rifle only!
Hornady Manual List for TC Contender 14" bbl Fed 210 prime,Horanady brass ,maximum C.O.L. 2.830" Max Case length 2.040", Case trim length 2.030"
Hornady 100 gr FBHP # 2800
RE15 Start 35.4 GR @2400 fps 36 gr@ 2450fps 36.6 gr @ 2500 fps 37.2 gr. @ 2550 fps 37.9 gr. @2600 fps. MAXIMUM of 38.5 gr @2650 fps
If you can get your hands on a Speer #13 there is 2 pages on 7X30 Waters TC handgun data , if you have a particular bullet in mind
( there are 8 fom Speer) give me a holler and i'll send you the data on a PM