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Looking for some insight regarding arrow trajectory

A

AU67Skeeter

New Member
Joined
Aug 25, 2023
Messages
4
Ok here goes; I've been shooting a Mathews z7 extreme since 2012, with Carbon express maxima hunters 250's.
These arrows are 8.9gpi and fly @ 275-280fps per my chrony. Since these are not in production anymore and Im down to my last two. I started looking for some replacements. I found Easton Axis 5mm 340spine. @ 9.5gpi. These are flying @ 250-255fps and drop about 6-8" lower than the Maxima hunters at 25 yards. This seems a little much for such a minimal change in weight.


My calculated TAW:
Maxima Hunter= 367g @ 277fps
Easton axis= 387g @ 255fps

Would 20g of weight make that much difference in velocity/Trajectory?
 
Possible the 340 is two soft of a spine. You may be loosing some energy in the arrow.
Or arrow size/ noc is different and it's de-tuned. Paper check the new arrows for bad flight.
That's all I got.
 
Seems like it slowed down an awful lot for only 20gr . Most things say about 1 FPS for every 3 gr change in weight.

Arrow Speed Calculator: Calculate or estimate arrow speed.

Arrow Speed Calculator: Calculate arrow speed based on IBO standards: 30-Inch Draw Length, 70-Pound Draw Weight, 350-Grain Arrow.
www.westernwhitetail.com www.westernwhitetail.com

Victory RIP TKO are 8.7gpi @ 350 spine, if you're interested
 
I've shot both 125 grain and 150 grain field points on my arrows and didn't notice any difference at 20 yards if that helps at all.
 
As @DroptineKrazy said, I've shot 100 and 125 field points with my bow on the same arrows and impact was barely noticable at 20 yards so I don't believe it's the extra weight either. Have you actually weighed the two arrows to make sure there's not a hidden difference? Heavy inserts to go with the gpi difference or something?
 
AU67Skeeter said:
Ok here goes; I've been shooting a Mathews z7 extreme since 2012, with Carbon express maxima hunters 250's.
These arrows are 8.9gpi and fly @ 275-280fps per my chrony. Since these are not in production anymore and Im down to my last two. I started looking for some replacements. I found Easton Axis 5mm 340spine. @ 9.5gpi. These are flying @ 250-255fps and drop about 6-8" lower than the Maxima hunters at 25 yards. This seems a little much for such a minimal change in weight.


My calculated TAW:
Maxima Hunter= 367g @ 277fps
Easton axis= 387g @ 255fps

Would 20g of weight make that much difference in velocity/Trajectory?
Click to expand...
What’s your arrow length? Sorry if I missed it
 
20 grains would account for 6-7 FPS difference in speed. If you are dropping 22 FPS in speed, you should have around a 70-grain difference in weight between the 2 arrows.

Recheck your arrow weight and recheck your chrono.
 
To get technical (lol) there is a major difference between your two arrow setups, at literally every level. It's not the 20gr TAW that you're seeing.
- Arrow spine is almost off by a "rated" two spine difference, and I personally found the Eastons to be stiffer than listed.
- FOC/balance is going to be different.
- Arrow construction is physically completely different, and even further so if you believe the dual-spine advertisement of Carbon Express on the Maxima series.

The Carbon Express Maxima RED was designed to be a direct replacement for the Maxima Hunter series, but I personally currently prefer the Easton shafts. I shot the CE Hunter/RED arrows from about 2007-2018...
 
Isn't carbon express the oddball spine rated company? Not doubting your knowledge @bowhunthard88 just checking
 
Thanks for all the replies!
Arrow length is 27" ( going from memory but I think that's right) and 70# draw wt.
Horn said:
Seems like it slowed down an awful lot for only 20gr . Most things say about 1 FPS for every 3 gr change in weight.

Arrow Speed Calculator: Calculate or estimate arrow speed.

Arrow Speed Calculator: Calculate arrow speed based on IBO standards: 30-Inch Draw Length, 70-Pound Draw Weight, 350-Grain Arrow.
www.westernwhitetail.com www.westernwhitetail.com

Victory RIP TKO are 8.7gpi @ 350 spine, if you're interested
Click to expand...
This was my thoughts as well, I just wanted some second opinions. I will check out the Victory's thanks!

MattMan81 said:
Possible the 340 is two soft of a spine. You may be loosing some energy in the arrow.
Or arrow size/ noc is different and it's de-tuned. Paper check the new arrows for bad flight.
That's all I got.
Click to expand...
@matttMan81 My bow was originally paper tuned for the maxima hunters and that may be where the difference is. Haven't had my bow paper tuned in a while, its always been spot on with the Maxima's so I never worried about it. I don't have a bow press, nor have I personally ever done my own tuning. Maybe the spine is too soft.


I was calculating the arrow weight based on factory installed inserts, fletching and knocks, per some specs I found online. I need to get some kind of scale to measure the actual weight to compare. I believe the chrono is correct, speed has been consistent over time.

Our season opens this weekend. I will shoot the Maxima's until they're gone and maybe tryout the axis on some hogs if the opportunity arises. I probably need to get my bow to a shop for paper tuning with the axis/ or some other arrow, and see if that helps
 
bowhunthard88 said:
To get technical (lol) there is a major difference between your two arrow setups, at literally every level. It's not the 20gr TAW that you're seeing.
- Arrow spine is almost off by a "rated" two spine difference, and I personally found the Eastons to be stiffer than listed.
- FOC/balance is going to be different.
- Arrow construction is physically completely different, and even further so if you believe the dual-spine advertisement of Carbon Express on the Maxima series.

The Carbon Express Maxima RED was designed to be a direct replacement for the Maxima Hunter series, but I personally currently prefer the Easton shafts. I shot the CE Hunter/RED arrows from about 2007-2018...
Click to expand...
yeah I almost went with the reds, as a replacement. and the spine numbers are confusing, found the axis local and thought id try them. just went off the chart for the spine. Should I be looking for a higher number easton spine?
 
AU67Skeeter said:
yeah I almost went with the reds, as a replacement. and the spine numbers are confusing, found the axis local and thought id try them. just went off the chart for the spine. Should I be looking for a higher number easton spine?
Click to expand...
A comparable Easton spine would be 500, but your bow specs would be better suited to a 400 or 340 in my opinion (at your weight/DL). The two arrows are on opposing ends of the spine spectrum and they're not going to tune the same and that's probably the difference(s) you're seeing.
 
AU67Skeeter said:
yeah I almost went with the reds, as a replacement. and the spine numbers are confusing, found the axis local and thought id try them. just went off the chart for the spine. Should I be looking for a higher number easton spine?
Click to expand...
As for CE, I would've initially recommended the 350 spine...
 
The tune may just be adjusting your rest height. The arrow may be sitting slightly higher or lower. If you want to start messing with it. Just shooting the arrow thru paper should tell you something I would think. Or video the shot. It may explain the change in POI.
 
MattMan81 said:
The tune may just be adjusting your rest height. The arrow may be sitting slightly higher or lower. If you want to start messing with it. Just shooting the arrow thru paper should tell you something I would think. Or video the shot. It may explain the change in POI.
Click to expand...
Good point here, I hadn't thought of; smaller diameter shaft is going to have a lower POA vs the original maxima, if even by a small margin I guess I'm starting out aiming low with the thinner shaft Axis. Definitely gonna have to get it tuned for new arrows.
 
AU67Skeeter said:
Good point here, I hadn't thought of; smaller diameter shaft is going to have a lower POA vs the original maxima, if even by a small margin I guess I'm starting out aiming low with the thinner shaft Axis. Definitely gonna have to get it tuned for new arrows.
Click to expand...
Correct .244 vs. .204.
 
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