Okay, update and a question for people who have actually reloaded a lot.
My new Redhawk.....shoots JHP bullets roughly 4" left of where my hardcasts hit, my Super Blackhawk clusters them all the same right<>left with just minor changes in elevation.
(my loads, for reference)
#1:.44 mag case, 240 XTP over 24.5 grains of IMR 4227 1370fps
#2: .44 mag case, 200 XTP over 27.5 grains of IMR 4227 1480fps
#3. .44 special case 240 hardcast over 9.5 grains Accurate #5 960fps
#4 .44 mag case, 240 hardcast over 11 grains of Accurate #5. 980fps
I tried load #4, because I thought if I boosted velocity a shade it might shift POI a hair.
BUT.....Load #4 chronies about the same velocity as the Load #3. With a fast-burning powder like #5, I thought it would be at least 100fps faster.
My question: all I could find is the .44 mag case has about 15% more capacity. That enough to drop pressures to nearly the same velocity?
Also....I don't want to lead up the barrel, but I want to tinker a bit and try to get the POI's nearly the same R<>L. Elevation ain't a biggy.
ALL my other guns with specials in magnums, heavier, lighter,etc. just change elevation, R<>L is unchanged.