Arrow, Spine, Broadhead Weight Setup.

[section8mainiac]

I just had new strings installed on my Mathews Halon 32. It is a 70 lb bow with DL of 29.5. I am headed back to CO for another elk hunt this fall.

The new strings have bumped the measured weight to 74.5 lbs.

I just received another dozen new Easton FMJ 330 4mm injexion arrows. (11gpi)

They are set up with the 50 grain easton outsert up front and i am running a 100 grain head for a total arrow weight of +-495 grains.

My concern is that now that I have added weight to the pull that I will not have enough spine in the arrow. I was also contemplating 125 grain heads to get a little more FOC and weight to the arrow for penetration.

I know there are some very smart and experienced guys on here. Any advice or input is appreciated.

Thanks, Matt

 

[Trial153]

First things.....shoot it however you usually tune, paper, bare shaft ect ect ...if it workable then use it. If it shows a weak spine reaction. Take a turn out of each limb bolt and call it a day.

 

[Rob5589]

Shoot it and see if it tunes. If not, you can take some draw weight out it. For me, I would have been shooting a .300 @ 70 lbs draw wt.

 

[wildwilderness]

Are you sure the new strings/cable are set at factory specs? Measurements? That’s a bit of a jump in draw weight.


As said if it won’t tune drop poundage or lower your FOC expectations and just use a standard insert and 100 gr tip

 

[MattB]

Are you sure the new strings/cable are set at factory specs? Measurements? That’s a bit of a jump in draw weight.

This. I would bet you have a 29.5" bow that draws 30" or a touch more.

What was the draw weight before you changes the cabling?

 

[Desk Jockey]

Far from an expert but my bow has similar specs. I posted a thread here about arrow selection and based on that and some other input I did a pepsi challenge with 5 flavors of arrows. My rig seems to be liking and lower spine.

Currently zeroing in on a 5mm injection with a 50gr insert, 25 gr collar and 100 gr broadhead. Still testing 300 and 260 spine to see what shoots best.

 

[section8mainiac]

This. I would bet you have a 29.5" bow that draws 30" or a touch more.

What was the draw weight before you changes the cabling?

I am somewhat of a geek when it comes to testing everything. This setup was 69.8 pbs when I bought it in 2018. It had dropped to about 67.9 before I just had it restrung last week by by archery shop.

It shot bullet holes in paper with the new strings when set at 70 lbs.

I have only had the opportunity to shoot it at about 8 yards so far. I did crank it up to see if it shot any different and did not see a difference.

 

[WakePraySlay]

I have the same DL as you and put on 75lb limbs just recently as well as new strings and cables. I’ll be pulling close to 80lbs if not a touch more. I went with the 250 dangerous game fmj’s. Most guys said it’s better to be over spined than under and I couldn’t agree more. Also if you don’t wanna change your arrows like mentioned above, back that draw weight out.

 

[MattB]

I am somewhat of a geek when it comes to testing everything. This setup was 69.8 pbs when I bought it in 2018. It had dropped to about 67.9 before I just had it restrung last week by by archery shop.

It shot bullet holes in paper with the new strings when set at 70 lbs.

I have only had the opportunity to shoot it at about 8 yards so far. I did crank it up to see if it shot any different and did not see a difference.

Since you are a geek, what was your draw length and is it?

 

[section8mainiac]

Since you are a geek, what was your draw length and is it?

29.5. The new strings and setup was all dialed in with a draw board at the archery shop.


Thanks, Matt

 

[MattB]

29.5. The new strings and setup was all dialed in with a draw board at the archery shop.


Thanks, Matt

Are tha ATA and BH the same as before? Something must have changed influence the draw weight.

 

[section8mainiac]

The BH is still at 6” as it is barely touching the dampener. The ATA is currently 31 15/16. I am not sure what the factory spec for the Halon 32 is, but I assume 32” when looking at the chart below.

Is it plausible that the combination of the strings being slightly shorter and the being new strings stretching less and gained the 4-5 lbs?

Thanks, Matt

 

[Swampcruiser]

The longer aim string actually increases poundage. I'm betting it’s more in the cables or harnesses being slightly shorter.

 

[MattB]

The longer aim string actually increases poundage. I betting it’s more in the cables or harnesses being slightly shorter.

I tend to agree, something changed. 4-5# is a fair bit but seems to be plausibly given it sounds like that was the only change.