Just got back from some testing.
.44spec cowboy loads, 3" bbl, rapid fire, all go center of mass on moving target. .44 spec cowboy loads a bit disappointing on bowlin pins. My 2.5" 686 with semi stout factory 180 gr jhp went THROUGH fattest part of bowling pin, expands to well over half inch and the pin hits the ground bout six feet past the far edge of the table. Nice combination, ton of energy expended in the target AND adequate penetration. For comparison my mod 36 gets the pins off the table but have to head shoot em.
As far as time to get big guns on target, I watched Sig P220 shooter get two moving bad guys with seven rounds each in bout three seconds, from conceiled including the reload. All fourteen rounds were in center sternum areas of the two BGs. The Sig shooter was pushing the cyclic rate limit of the gun. He is a bit faster with big wheel guns.
I carry 125gr at 1200 in my deep cover mod 36, kinda sad when the 1902 vintage .38spec does the same as the 1902 vintage 9X19 stretched to the max. My 36 weighes just under 25 ounces loaded and jumps out of the leather.
I like the 9s but want nothing less than 9X29, favorite is the 9X32.
Sam.......runnin for cover.