This was about the closest they listed to a "real" .44 Magnum loading
(https://scontent-iad3-1.xx.fbcdn.net/hphotos-xpa1/v/t1.0-9/1495478_1025011070870258_5219342041009406064_n.jpg?oh=fac7152726835d412c5a095344d75983&oe=57961986)
Maker of the X-Treme brass:
http://www.xtremebullets.com/Brass-s/48372.htm
They rated these at 1290 FPS and they got close enough.
1291, 1273, 1257, 1280. Average = 1275.25 FPS/ 867 LBS