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Will the weight of the fieldtip/broadhead stabilize my arrow (faster or slower)? I have 75, 85 and 100 grain tips. I jumped up from the 75 to the 85 grain tips and my groups improved. Can I expect the same thing or better from the 100 grain tips? Is there an optimal tip wight for bows? If so what is the science behind it?

I am shooting CX terminators 6075 that are 29.5 inches long (325 grains with no tip) out of a Hoyt Turbohawk bow.
 

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Your gran tips you use are and part of the formula of your arrow being splined right for your pondage of bow. The easiest way to see how it effects your arrow it shoot threw paper, you will see how each tip tears and find out wich suits best. Just keep in mind the first step is to make sure your arrow is not over or under splind.
 

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In essence, a lower point weight will give your arrow a "stiffer" spine and a higher point weight will give the arrow a "weaker" spine. More weight upfront will move the balance point forward (front of center, in current lingo), which is considered important for accuracy.

Do you see issues with the arrow flight with the lighter points?
 

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+1 what they said. What you may gain in initial speed (right in front of the bow) with lighter tip weight, you may loose in down range momentum and accuracy. Many of the top 3D shooters are going to heavier tips to get tighter groups outside 40 yds.
 

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well with that set up with u went with a 125 tip u would be spined just about right, u would be shooting around 265 fps with 72# of K.E. and ur FOC would be at 12 so thats sounds like really good numbers to me
 
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