Yeah I wouldn't be surprised if that were true because I
bought my manual back when it was current and I had a few
problems with .357 loads and SR4756 powder. But it seems
to me that the backlash against old data and supposed
changes in powder formulation along with changes in how
pressure is measured has produced a generation of
handloaders that are so fearful that I wonder how they can
handload at all. I started handloading back in 1966 and many
handloaders back then routinely loaded on the high end of
published data with no worries or consequences. The Speer
#8 manual led to some problems with handgun loads, most
of which used one powder, SR4756. There's way too much to
go into here but if anyone seriously believes that their model
marked K frame will be damaged by using 7.0 grs of Unique
with a 125 gr JHP then I'm not going to waste my time
trying to bring them to reality. Caution is a good thing in
handloading but it seems that many handloaders today have
such a level of fearfulness that to repeat, I don't see how
they are able to load at all. Some of the old data might have
been overpressure but much of the information about loading
and powders that is fearfully passed around today is more
than equally false.