Arrow tuning

[bowmaster12]

Just got a new tall tines bow at 46lbs.  I grabbed the only arrow i had that would be close a 45/60. With a 300 grain tip it.  It was close but still nock right. I want to shoot a 200 grain tip.  My question is if anyone has a rough idea how longer of an arrow will be needed to make up for 100 grain less tip weight?

[McDave]

My experience is that length has a greater effect on tuning than tip weight.  I use tip weight to tune when I’m very close to being in tune, and just need a little nudge one way or the other.  You didn't tell us the length of the arrow you tried, so I don't know how much length you have to work with.  I’m not familiar with the 45/60 spine.  The old 35/55 converted into the modern .500, so I assume .500 is weaker than 45/60, but maybe not by much.  Of course, another thing we don't know is how far out of tune the arrow you have is with a 300 grain tip, so I’ll “assume” it was close to being in tune.  I think if you have 2” to work with, it would be worth trying a .500 spine full length with the 200 grain tip you want to use.

[Orion]

Put the 200 grains up front on that arrow and shoot it.  I think it will work. 

[bowmaster12]

The arrow i have is 28 inches i know it needs to be longer.  I did shoot it with 200 up front but its stiff.  With 300 its still stiff maybe a 1/4" off. I'll start with a full length and go from there when i get the chance.  Was just looking for a rough idea or others thoughts.  My guess i'll end up around 29.5.  I know there are way smarter tuners out there than I

[Roy from Pa]

I believe the rule of thumb is, for every inch shorter or longer the arrow is, the dynamic spine changes by about + or - 5 pounds, depending on arrow length.

[JonCagle]

I would buy a full length arrow, put the 200 grain point on it and start cutting from there if I needed to. I think 3 rivers still has a deal on gold tip classic blemished shafts that are 32.5 inches

[BigJim]

I would recommend 500 spine arrows. Generally just right for 50 +- lb bows with 200 up front and cut to suit.

I would also stay away from the classics. They are good arrows and all, but stupid heavy shafts especially with the supplied inserts and a 200 grain point. 
BigJim

[GCook]

Just got a new tall tines bow at 46lbs.  I grabbed the only arrow i had that would be close a 45/60. With a 300 grain tip it.  It was close but still nock right. I want to shoot a 200 grain tip.  My question is if anyone has a rough idea how longer of an arrow will be needed to make up for 100 grain less tip weight?

My arrows tend to be in the range of 25 grains up or down per inch of shaft.  I shoot 400s and 340s.  50lbs of draw at 26.5" and run my arrows at 30.5".  My bows are cut an 1/8th past center.  My TT included.  Run calf hair shelf pads so it adds minimal thickness.

[BigJim]

Gcook, one reason that only 25 grains can make up for an inch of shaft for you is that your using shafts that are considerably too stiff for the bow. However, if it works for you, it's hard to argue.

Consider it like throwing a curve ball or a straight ball. The slightest little change to the curve ball will make it go elsewhere where as the straight ball can endure more before it is out of shape.

So an arrow that is more erratic coming off the bow can be changed with less than one that is for the most part coming off straight.

You will know when you have an arrow that is pretty darn close to optimal when you can change 50 grains up front.. or more with little visible affect to flight of a bare shaft.

Form is a fluid thing however. Once you think you have it all figured out, something in your form changes undenounced to you and your left scratching your head.
BigJim

[Part Time Archer]

Always err on the slightly stiff side,to weak and you will have incurable cork screw flight.stiff arrows will always fly with no corkscrew and in the end you will always have usable arrows.i have found once too weak (weak to the point of cork screw flight) you can't adjust the arrow out of it.

[Part Time Archer]

Worst archery info ever is ,you need 10 lbs under for a long bow,even if accounting for bending around the handle.that info caused a lot of first timers to spend money on unusable arrows.