I do not, and have no experience with 200gr 38SPL. I would think a faster powder would be a better choice. Something in the Universal range would probably be optimal. I do have experience with IMR4227 and was merely trying to point out that you have IMR4227 specific data that points to a warmer starting point. If you already use this powder in .357, Im likely preaching to the quior. Back before Hodgdon owned the du pont powders, there was a difference between the two 4227's, but i dont think there is now. Regardless, you have IMR4227 and IMR4227 load data, so I wouldn't be concerned with the old H4227 starting point.