Groo here
As I remember,,, the 357 "HOT" loads were built with LEAD
SWC's and shot in at least 6 in barrels.
Similar loads with jackets will not be as fast...
Lets match apples to apples here..
Also the keith bullet was designed to use as much of the
cylinder as possible [ And they were shorter than today]
with 38 spec and 44 spec cases..
Even with magnum cases the over all length was about the same.
[ Those short cylinder you know]
The original loads were hot { I shot them in M-28's and Pythons]
but the now ones are somewhat slower due to the jackets and
the use of smaller guns..