I ran them both
FMJ 400's
Approx 417 gr's
FOC 10%
Est. Speed 285fps
Spine off the chart on the weak side
Standard Axis 400's
Approx 390gr's
FOC 11.5 %
Est Speed 294.
Spine also way off the scale on the weak side.
The optium spine in the Axis FMJ and Axis is the 340.
FMJ 340
Weight approx 452 gr's
Est Speed 276fps
FOC 9.7%
Axis 340
Approx weight 406 gr's
Est Speed 289 fps
FOC 11.1%