Depends on the Pedersoli's "strength" rating. If rated with that of the .45 Ruger Blackhawks, it will match any .44 Mag. loadings, power wise even though the usable pressure is just a bit lower. I think this runs in the 30,000psi in the Rugers rather than the .44's 36,000psi.
This equal vel. is due to the greater expansion ratio having the larger bore and slightly greater case capacity.
Always wanted a Ruger Blackhawk in .45 Colt, but only have a .357 Mag. I do love the 4 5/8" bl., however longer barrels are preferred for target shooting.
Data I have (Hodgdon's Annual Manual) gives loads producing over 1,200fps with 335gr. cast bullets for .45 Ruger, etc, handguns & 1,350fps with 300gr. cast bullets. 7 1.4" bl. revolver with likely .002" to .003" cylinder gap.