It's a neat looking little gun, but I don't have any idea about an easy way to get the barrel off.
As you old timers know, and you folks who are new to cap and ball will soon find out, the loading lever is the key to getting the barrel off of the Colt pistols.
To do this, first tap the wedge back thru the barrel from the right side. Don't try to remove it completely from the barrel. There is a small screw on the left side that is intended to keep the barrel wedge from falling off and getting lost.
After the wedge is pushed out of engagement with the barrel pin, put the hammer on the half cock position and rotate the cylinder so the web between the chambers is aligned with the loading lever ram.
Lower the loading lever and apply a little pressure and the barrel will "jack" right off of the cylinder/barrel pin.
Now, in this case, the loading lever is not part of the barrel so there is nothing built in to the gun to help remove the barrel.
My best suggestion is to get a piece of hard wood and whittle it into a tapered wedge which can be placed between the lower part of the barrel and the front of the chamber. Use this to pry the barrel forward.
As for the "loading tool" I don't know what it looks like but I assume it is just a brass rod?
If so, I would suggest that you make your barrel removal wedge with a flat on the side of it.
Charge the chamber and place the ball on it.
Use the flat side of the wooden wedge against the ball and give it a tap with a non-metallic mallet to start the ball into the chamber.
Use the brass "tool" as a punch, tapping the ball down against the powder with the side of the wedge.
Now, if the loading tool is really a tool like the Patterson came with, the cylinder fits on the vertical pin and the loading ram is then installed thru the vertical pin.
The "ram" that is hanging down is used against the top of the ball to shove it into the chamber, just like it would used be if the tool was built into the gun.
Although this is just a BS guess, it is what I think I would do if I had this pistol.
