Have a J frame Model 60, pro Series from S&W performance center with a 3" barrel. I can tell a pretty decent difference in 38+P rounds and .357s. Maybe it is the extra 1/2" on the barrel, but the .357s launch pretty hot and seems to take a bit longer to reacquire the target in rapid fire. That said, I carry Hornady Critical Defense rounds in .357 and feel confident that I can and will use the gun effectively if required. a quick speedloader belt set and 15 rounds available if needed.
What kind of speedloader set do you use? I usually just drop one or a speed strip in my pocket.