Loading .44 Colt is a bit of a problem unless you have the bullet of the original design. That was a bullet that had a .452 diameter nose, and a .430 diameter base within the case. This is a rebated bullet.
Our .44 Spl. / .44 Mag. Resizing die will size the case to the proper diameter, but if you install a .452 diameter bullet into it, it will stretch the case and the cartridge will not chamber in your revolver.
If you use a .430 diameter bullet, it will load fine into the Cartridge case, but will be loose in the barrel.
It is all about the bullet.