You can go to Hodgdon's website and the online data and find 215gr cast data using Tightgroup. These loads are rather light and under 1,000 fps.

My old Alliant data from 2002 says you can use 7.9 grs maximum of Green Dot with a jacketed 220gr bullet for 1,140 fps. For a lighter cast bullet load with the 215gr bullet I'd reduce 20% and load using 6.3 to 6.5 grs and that should be sub 1K fps. Need a chrono on that one.

7.0grs of W231 behind a 215gr LSWC bullet in Remington cases lit by a WLP primer chrono's at 956 fps from my 4" S&W 657. The old Winchester data recommended a max of 7.4grs with a 210gr LSWC.