the spine varying with both the construction and length of the arrow.

Another important consideration is that the IBO (International Bowhunting Organization) recommends at least 5 gr/lb of draw weight as a safety buffer. This means a bow that draws 60 lb would need at least a 300 gr finished-with-tip arrow. Shooting arrows lighter than this guideline risks damage to the bow similar to that caused by dry-firing, which can in turn cause injury to the archer or anyone standing nearby. Shooting arrows that are too light also voids most manufacturer