Fran,

I was just looking at their comparison chart.

I have CX 3D Select 300's and at 63#'s my Ally does 284 fpswith a 125 gr tip andwrap (arrow weight at 391 grs). My GT 7595's are at 293 @ 72# at a weight of 421 gr.If their numbers are right for the iron Mace the Ally could actually be faster with those light arrows. I know 1" of draw length makes a difference.

If I wasn't concerned about the damage to the bow I'd have to try one of those arrows in my Ally. I still don't think it produce the numbers you are getting though.