There probably are specialty loads out there, CorBon?, who hot load it.
In either case you, hand-wrist-ears, will definately know when it goes off in a short barreled light gun.
This may have been true as recently as the early 1960's,but it's not true anymore. Win Silvertip 200gr JCP's are supposed to run somewhere around 900fps out of a 4 inch barrell,so a 3 inch barrel isn't that much of a handicap. I'm going to have to dig out my chronograph one day and clock them out of my Rossi. I know they expand like a champ out of my Rossi. The high-pressure version of the 44 Special is called the 44 Magnum.
In either case you, hand-wrist-ears, will definately know when it goes off in a short barreled light gun.
Whoever told you this has never shot one. The average 10 year old girl could shoot one with no discomfort.
There are good heavy, defense loads available. From CorBon, W/W (Sivertip), CCI (GoldDot).
Mark