I can help you with the following, you will find velocity for the 3 levels of loads. You can also see good gunsmith names.
Regarding loads
http://www.hodgdon.com/data/pistol/
From Big Bores Sixguns book by John Taffin.
There is 3 levels of .45 Colt loads.
Level one :Colt New frontier and S&W Model 25
For these a 260 ge bullet at 1050 feet per second in the main course. It kills all out of proportion to its paper ballistics ans will penetrate deer completely on broadside shots.
Level two : we have the .44 magnum frame size .45 Colts, the Ruger Blackwak and Bisley, the Texas Longhorn Arms Improved Number Five and Flat-Top Target, the Colt Anaconda and the Dan Wesson. For these sixguns, a 300 ge bullet at 1200 feet per second muzzle velocity puts us into the largergema category. For this load level I prefer 21.5 gr of either H110 or WW296. Loading manuals go to 23 gr with jacketed bullets, so I feel perfectly safe with cast bullets and 1-1/2 gr less powder.
Level three : find us with the five-shot custom sixgub built on Ruger Blackhawks and Biseleys by sixgunsmiths such as Hamilton Bowen, David Clements, john Linebaugh and jim Stroh. All of these men are masters at building customs sixguns. With these sixguns built in th fivegun persuasion, .45 Colt loads with either 260 or 300 gr bullets at 1500 feet per second are easily and safely attained.
Hope this can help you.
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BER007
Keep the faith in any circumstances
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BBER007@HOTMAIL.COM