Changing spine

[bow101]

I have a few arrows that are slightly stiff. Generally I use 125gr, tips.  If I use 145gr.  I'am confident they will fly better. 
In cases like that is it better to increase tip weight or actually thin down the shaft to correct spine.  I only need a 3-4 pound reduction.

[DC]

One way adds total weight to the arrow, the other removes it. So do you want increased penetration or increased speed? Increasing point weight is easier. I always think lighter is better(old drag racer) so I would reduce the shaft. Confused yet? One way would move the FOC but I don't know anything about that

[TimBo]

I would try the heavier tips; if you decide you would rather use 125 grain, you can always sand the middle of the shaft later.  A reduction of 3-4 pounds is pretty fast and easy with sandpaper. 

[bow101]

One way adds total weight to the arrow, the other removes it. So do you want increased penetration or increased speed? Increasing point weight is easier. I always think lighter is better(old drag racer) so I would reduce the shaft. Confused yet? One way would move the FOC but I don't know anything about that

I hear ya about the weight, but another 20gr. should not affect flight that much would it.     I did try a longer shaft with a 125gr. point and the flight was erratic.   My finished arrows are roughly 30" from tip of point to tip of nock having a 27 1/2" draw.

[Rob W.]

I would rather use head weight to make changes when possible. A test kit with multiple field points is only a few bucks.

If you are in love with a certain broadhead that only comes in a certain wieght you can always drill a hole in point end and glue in some copper wire. 8ga copper is about 30gr. Per inch.

[DC]

I don't think I would make a change based on the flight of one arrow. Do you have another long arrow just to double check? I can't tell you how many times I've been taken on a goose chase by trusting one piece of data. Not just archery- cars, boats, any troubleshooting. I really don't know how much difference 20 gr would make.

 I was trying to reduce the spine on some arrows and they were bending when I checked the spine. Pappy told me to use a scraper rather than sandpaper. The sanding was actually heating the shaft enough let it take a bit of bend with the 2 pounds of a spine checker. I guess I could have waited a minute to let them cool of but I'm an impatient SOB.

[bow101]

I chuck the wood shafts in the drill and sanded them down you also get a truer round shape that way.  On another note I 'am sticking with the 30"  arrow.  In the past I have used longer shafts and they did not make the cut.  Besides spine my other problem is in the fletching inconsistency.   Having said that I will just install 145gr. tips.
How long are your arrows DC.?

[DC]

30"

[Pat B]

Adding 20grs of tip weight will reduce the effective spine by about 5#.