ORIGINAL: Nolehoe
A little more information-I'm using Hodgdon TiteGroup. the difference between the 357 load and 38 special load is 2.3g, 357 load is 6.3g and the 38 load is 4.0.
I wouldn't mind shooting that load. Especially with titegroup. Its going to be slower in the 357 case due to the more buring space. I can't say I have tried this one, but I know for Unique, alliant says you can download it more than 30%.