Mr_Flintstone
Just to be clear, the "problem" with magnum ammo using light bullets (110 gr. or 125 gr. for example) isn't really a "safety" matter. The issue is the possibility, with extensive use, of causing some failure at the breach end of the barrel due to what is essentially flame cutting at the forcing cone location. When this has happened, it has been the result of using thousands upon thousands of rounds of "hot" loads with the lighter bullets. If you mean to speak of the "safety" of the gun itself (that is, damage to the breach end of the barrel) then I suppose "safety" is a correct term. But if "safety" means the potential for harm to the shooter, it really isn't accurate. Frankly, occasional use of 125 gr. .357 Magnum ammunition in a Model 19 is no big deal. But in terms of your actual question, reduced loads in the magnum case is also no problem, as stated by H Richard.

__________________
Jack
SWCA #2475, SWHF #318