Just to keep beating this subject...I found a report by Ed Sanow who conducted an extensive review of this subject and yes you can do this. His comment was interesting to me that instead of using 38+P in a 357 you can use the 38 Super and get much more power, less muzzle flash, and better accuracy. Sound like what I will try out in my 66 and 386 NightGuard when it gets here.