Let's talk arrow spine and how it relates to accuracy. Arrow spine is one of those particular things within the scope archery that is so vitally important, yet no one really gives it a second thought.

You simply input your desired spine and arrow length and Sirius builds them for ... for ultra-heavy arrows in the 700-grain-plus range. Medium-weight hunting arrows hit the scales in the 450-grain ...

One important part of this is making sure each arrow has a spine of similar stiffness. Traditionally, this is checked in a very analog way by using weights and measuring deflection of the arrow ...