New arrows, new points?

SlimTim

FNG
Joined
Mar 4, 2021
Messages
72
I've recently bought some new arrows to try something different. I went from the nexxus 250 spine (11.1 GPI) to the easton axis 260 spine (11.5 GPI), cut pretty much the exact same length.

I've noticed the POI on the eastern is much higher (maybe 3 inches at 30+ yards) than the nexxus. Why is this? Is that slightly weaker spine make that much difference?

I've also been thinking about going up from 125gn to 150gn points before I get my sight tape sorted. What actual difference will this make? Am I slightly over spined and does this really matter? Will this make my groups better or tuning easier? Do I actually need to re-tune my bow (which for me seems like some mystical art that I'm never sure if I'm actually doing it correctly)

Thanks in advance.
 
Joined
May 6, 2018
Messages
8,820
Location
Shenandoah Valley
Aren't you comparing a micro (.166 id) to a small diameter (.204 id) that difference translated to od will put the center of the arrow higher at your rest. Which elevates impact, also will change the nock height (tune).
 
OP
S

SlimTim

FNG
Joined
Mar 4, 2021
Messages
72
Aren't you comparing a micro (.166 id) to a small diameter (.204 id) that difference translated to od will put the center of the arrow higher at your rest. Which elevates impact, also will change the nock height (tune).
Yes. That makes sense. I hadn't thought about that.
 
Joined
May 6, 2018
Messages
8,820
Location
Shenandoah Valley
You won't see much of any real world difference between 150 or 125 heads, except selection.


Hard to know where you are weak or stiff spine. No information.
 
Joined
Nov 25, 2016
Messages
3,721
Location
Utah
If you told us the Bow, the bow DW , your DL and total arrow weight we can better help you. There's more info needed but not as critical for a base est of guidance.
 
OP
S

SlimTim

FNG
Joined
Mar 4, 2021
Messages
72
If you told us the Bow, the bow DW , your DL and total arrow weight we can better help you. There's more info needed but not as critical for a base est of guidance.
PSE EVL 32. DW 70#, DL 29 inches, arrow length 28.5 inches. Total arrow weight about 510gn.
 
Joined
Jun 21, 2019
Messages
2,229
Location
Missouri
Are total weights of both arrows the same? Even though the Axis gpi is higher, its total weight could be lower depending on the weights of other components. If the Axis TAW is lighter, that would help explain the higher POI. Or it could just be due to the larger diameter changing the launch angle as Billy Goat pointed out.

I had to make some assumptions on missing info, but qSpine indicates that you're probably on the stiff side. Spine software/charts just give a recommended starting point though, not a hard-and-fast requirement for good arrow flight. You can quite likely get those arrows to fly just fine even though they are on the stiff side of calculated "optimal" spine.

Bow inputs: 345 fps IBO, 70# DW, 29" DL, 32" ATA, 6.25" BH, 80% LO
Arrow inputs: 28.5" C2C, 125 gr point, 25 gr insert, 9 gr nock, 3 vanes at 7 gr each
Screenshot_20220330-212126_qSpine.jpg
 
Joined
Mar 11, 2014
Messages
398
Location
Michigan
Yes, you need to recheck your tune, probably lower the rest. As stated above the axis is a slightly larger diameter. Probably have a tail low tear now if it was in tune before the change.
 

Kholt456

FNG
Joined
Feb 1, 2022
Messages
57
Aren't you comparing a micro (.166 id) to a small diameter (.204 id) that difference translated to od will put the center of the arrow higher at your rest. Which elevates impact, also will change the nock height (tune).
Agreed
 

Cs36

FNG
Joined
Mar 20, 2021
Messages
16
I just switched recurve bows, and added 3lbs roughly in draw weight . I was shooting 500 spines in my old bow w #49lbs draw @ 28 . 450s are shooting weak in new bow that’s #52 @ 28. I’ve got a 26” draw. Should I jump down to 300, 350, for my arrow selection? Thanks fellas
 
Top