Techy! I've heard lots of good thing's about the Axis s/t's and I'm definetly going to give them a try myself.If you look through some of the past post's in here you'll find some good view's on them. The people talking about them are the best, who know what they're talking about. Authur P is one of them, he's got lot's of good info and will help you out on this . I'm not the best with spline, so I listen to these guy's on these topic's. I have questioned these arrow's and spline's with these guy's before and the 400's are highly recommended.I'm shooting a 60# 2004 Patriot Dually with 29" draw and these are the one's they recommended for me as well.

nubo