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<blockquote data-quote="Lungdeflator" data-source="post: 203954" data-attributes="member: 5163"><p>The FMJ is a heavier arrow, so 10.3 GPI sounds right. The 400 number is a stiffness or spine number. Typically, the lower the number 300, 250, 200 etc... the stiffer the arrow. Opposite for the higher numbers. Thats where referencing the arrow spine charts with your bows poundage and draw length come in. If you are right on the edge of 2 spines on the chart, go with the lower number, the stiffer spine.</p></blockquote><p></p>
[QUOTE="Lungdeflator, post: 203954, member: 5163"] The FMJ is a heavier arrow, so 10.3 GPI sounds right. The 400 number is a stiffness or spine number. Typically, the lower the number 300, 250, 200 etc... the stiffer the arrow. Opposite for the higher numbers. Thats where referencing the arrow spine charts with your bows poundage and draw length come in. If you are right on the edge of 2 spines on the chart, go with the lower number, the stiffer spine. [/QUOTE]
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