Change Arrow Spine or No?

[bkatz1]

Bow Specs:
Mathews ARC 30
75lb DW
28.5 DL
Current spine: 300
Current total arrow weight: 447-450gr

Currently shooting RIP TKO's in a 300. Bumped the bow from 70 to 75lb DW. Should I re-spine? I've had 0 issues for Whitetail with 100 grain broadheads, but if I want to jump to 125s for elk season I'm thinking I may be too light on the spine?

Or im fine tuning a pile of shit... please advise. Thanks in advance.

 

[Ashy Larry]

450gr at your specs is killing anything. I wouldn’t bump to 125 if it were me. You’ve got speed, foc and weight all on your side already.

 

[Mighty Mouse]

Shoot broadheads alongside field points and see if you can get them to hit together. If you can, your arrow spine is fine. If you can’t, you may need to go to 250. I’m guessing you’ll be fine with 300.

 

[Eastonsgrandpa]

What is your component weight up front and how long do you have your arrows cut, carbon to carbon?

I always go up a spine when building, but you might be just fine where you are.

 

[joshnewman82]

what do the spine charts say? That’s where I would start. What target do you all shoot your broadheads at?

 

[nphunter]

I wouldn’t, 300 spine is plenty stiff at your DL and 75lbs as long as you’re cutting them to 28.5” or shorter.

 

[bkatz1]

Took it to the range today, 1 field point, 1 SEVR 2.0 (in practice mode), and 1 Iron Will s100.

This was my group at 40yds. The 2 on the right are the SEVR and Iron Will.

 

[rizay-52]

Bow Specs:
Mathews ARC 30
75lb DW
28.5 DL
Current spine: 300
Current total arrow weight: 447-450gr

Currently shooting RIP TKO's in a 300. Bumped the bow from 70 to 75lb DW. Should I re-spine? I've had 0 issues for Whitetail with 100 grain broadheads, but if I want to jump to 125s for elk season I'm thinking I may be too light on the spine?

Or im fine tuning a pile of shit... please advise. Thanks in advance.

You're good to go with 300 spine as long as your arrows aren't obnoxiously long.

 

[TedO]

If you’re right in the middle of spine weights (on the chart), a Mathews bow will usually perform better if you spine down. Depending on arrow length/components, that may not be a hard fast rule, but that’s the recommendation of their engineers given typical arrow builds.