RE: .44 v. .45
For 45 Colt fans, Buffalo Bore has standard pressure 45 Colts loaded to a bit over 500 foot pounds. They also list ballistics for a few different pistols. They state that the load is safe for post war 45 revolvers.
The only malfunction I ever had with a M1911 45 auto was one round of semi wadcutter in thousands of rounds.