Don K., QuickLOAD estimates your load is generating 23,426 psi, with a muzzle velocity of about 975 fps. SAAMI maximum for the .44 Special is 15,500 psi. As a side note, QuickLOAD also estimates that 71% of the powder is burned before the bullet exits the barrel, and a ballistic efficiency of 17.2%.
I'd be interested in knowing how this velocity estimate compares with your real-world results (when your chronograph is available again).