CraigC
Sixgun Nut
To the OP, I would highly suggest putting alot of miles on a .44Mag or two before venturing into anything bigger. I'm a big bore nut and have been shooting the cartridge for 20yrs and have yet to "master" it. Properly loaded, there is very little that it cannot accomplish.
That said, in a six-shot Ruger, the .45 does NOT shade the .44Mag. The two are very similar, each with its own advantages and disadvantages.
There is nothing weak about the .45 case. Dick Casull developed the .454 in .45 cases. Think 260's@2000fps in a custom fivegun. He was also an accomplished gunsmith and went from highly modified Colt SAA's with five-shot cylinders and special heat treating to building complete guns from scratch. Today, custom five-shot Rugers are routinely run at 50-55,000psi without incident. There is no issue with .45 cases, it's a myth that won't die.One, .45 Colt brass can't handle Casull pressure levels or even hot .44 mag pressures.
That said, in a six-shot Ruger, the .45 does NOT shade the .44Mag. The two are very similar, each with its own advantages and disadvantages.
Original blackpowder ballistics were a 255gr swaged bullet at no less than 950fps. Modern SAA's are capable of 1050-1100fps with a 250-270gr cast bullet.1000 fps and 265 gr. doesn't sound like an original load to me. It sounds AWFULLY hot for a 120 year old Colt Single Action Army revolver!