Arrow Spine?

[Bloodrunner]

Never really paid attention to arrow weight, just always picked the lightest to gain the most fps. I have a 2008 black ice by bowtech @ 50#. Just picked up the Gold Tip Expedition Hunters. Arrow weight is around 350 grains by my calculations. The spine is .500. Should I be shooting a .400 spine? And could somebody explain the differences in fps if there are any between the two different spines? Excuse my ignorance if you would.

[BigFoot]

What is arrow length?

[enewman]

You did not give enough info to tell if 500 spine or 400 spine. I would figure if the arrow is longer then 28 in and has a 100 gn plus tip weight 400 spine. If 26 or less 500 spine should be okay.

Speed is going to be controlled by the weight of arrow, draw length,and lb of pull. If the two arrows weight the same no matter what the spine the fps will be same as long as draw length and lb of pull never changes. This is just a quick answer

[Bloodrunner]

oh yeah my bad. 30 inch arrow. 100 grain tip. 28 inch draw length.

[enewman]

oh yeah my bad. 30 inch arrow. 100 grain tip. 28 inch draw length.

Even at 50 lb with a 30 arrow your at the top end of a 400 spine. Why are your arrows so long. Most people with a 28 in draw shoot a arrow around 26.5 up to 28 in.

If you don't like the broadhead to be behind your head then cut your arrows at 28in and get 400 spine arrows

[Mudslinger]

Sounds to me like you told someone what your draw length was and they told you you needed 30" arrows or you just bought some 30" arrows already to shoot. Go to Lubbock Indoor Archery and get measured for the correct length of arrow and then go from there as far as what weight tip you want to shoot and what spine you will need. Not bashing you at all, just saying that sounds like what happens at places like GM and C.O. Heard a guy at C.O. tell a friend that if he would tell him his draw length then he would tell him what length arrow he needed, yea right!

[Bloodrunner]

Aight thanks for the help guys. never put much thought into arrow length,weight and spine when I know I should have. Didn't know my arrow length could be shorter than my draw length either.

[Overlord806]

The length can vary a little at a 28 inch draw. You can shoot an arrow from 26.5 to 30 if you would like. That also depends on what arrow rest you have. The reason most people cut there arrows down is to loose a little weight. But they still use the correct spine. Now when wondering about arrow spine that all depends on what poundage your bow is set too. As well as draw length. The reason that is important is if an arrow is under spine it will be consistently inaccurate. As well as potentially dangerous if it is very under spine. It could snap and go through your hand and that is a mess. Hope that helped

[hot_rod_eddie]

The spine is just a number that explains the resistance of the arrow to flex. Think of it like a fishing pole, some flex and some don't. Too light of a spline and you get distortion by way of inaccuracy, and you can actually break arrows. Assuming everything else is exactly the same, and the lighter spline arrows are not distorting, the higher spline arrows will be slower because your total weight will be higher. Use this chart, http://www.goldtip.com/arrowcontent.aspx?page=chart or other similar to determine a spline number. Matching spline size, draw length, arrow size/weight will make you a better shooter.