With only 45 years of hand-loading experience. I have found;
What with each firearm having it's own individual threshold in respect to the chamber pressures limits to that specific firearm.
I have found that pressure tolarances vary from firearm to firearm.
The desired level of ft lbs of energy / fps of velocity for your application may be achieved by carefully
working up to that level of performance with a combination of different components.
If you reach pressure levels equal to or above that of what the firearm will tolerate you will see the signs,
flattened primers, difficult extraction of cartridge cases, pierced or blown primer and
excessive case head expansion or case head separation.
Having tried jest 'bout all the popular powders for pistol cartridges,
I have found that Unique and 2400 to fit the bill 99% of the time.
They just suit me right down to the ground.
I've loaded 38, 357, 44 Special and the 44 Magnum from mild to the serious...I have never had a firearm failure, period.
Oh, I'll admit that some of the 44 Mag. loads were on the border of the red line for
silhouette shooting at those 50 lbs. steel rams at 200 meters.
Those 29-2 had to be tuned on purty often...
For an improved performance 38 Special load to be used in modern 38-44 and 38 Spl./357 mag. revolvers,
My load of the hard cast 358429 sized .357 over a healthy dose of 2400 just flat works for me.
(The Lyman 45 Edition list a max. of 10.5 grains of 2400 under the above bullet. And a max. load of 11 grains for a 158 grain cast using #2 alloy)
Your experience may vary...
After y'all load up and shoot a few thousand of a specific load, let's hear how that goes.
Su Amigo,
Dave