I don't know if the Winchesters you shot were the same as the Winchester 44mag 240gr JSP's on Midway's site, but Midway's page shows a muzzle energy of 741 ft-lbs, which is near the bottom of .44mag energies I've seen for the commercial .44mag rounds I've looked at on Midway. I've seen at least two commercial .44mag loadings with energies of about 1200 ft-lbs. There seems to be a huge gap between the upper .44Sp loadings and the lower .44mag loadings ... nothing like the difference I see in loadings between upper .40S&P loadings and lower 10mm loadings.