If there was anyway you could get them to send 400's instead of the 350's,I would do it.They might be a little easier to tune broadheads but the 350's will work.


The 400 is .400 of an inch deflection when the shaft is supended between 2 points,28" apart with a 2lb weight hung from the center.(pretty sure this is correct)So you can see the higher the number,the more deflection there is.Meaning the arrow is weaker and is a lower spined arrow.


Some manufactuers do not rate their arrows this way but they should imo.Others like CX use arbritrary numbers that do not correlate to anything that I am aware of.A 250 is lighter than a 350 with those arrows.

Others have 45-60 or such and those numbers are 45# to 60# BUT that doesn't take into draw length or style of bow.Speed bows at 60# and 30" need a much stiffer spine than a 26" draw round wheel cam.So those numbers are very innacurate.


IMO,the best way is to list actuall spine deflection.Much easier to teach someone what that means than try and explain all the others.

As far as weight,spine deflection has very little to do with that.You can have heavy weight, light spined arrows as well as light weight,stiff spined arrows.