Am I underspined

[griffinit]

I've looked at the gold tip chart and it says I am, but my pro shop guy said I would be fine shooting 340's but I'm not having the best arrow flight in my opinion. I've told him but he still insists. That it isn't worth it.

My set up is a bowtech Realm-70lb- Draw length 28.5- arrow length 29. shooting 340 Gold tip Velocity XT's with 100 grain head.


Should I be shooting 300 spine?
Different arrows?

 

[Don Qui Puncher]

I have the reign 6 29 DL 71 lbs and I had the same issues with the 340's as soon as I switched to the 300's I didn't have an issue again. the local shop said 340 spine was plenty but when I called Lancaster archery they said its underspined for an aggressive cam like that and they suggested 300's and like I said I never had an issue again. id make the switch, you can buy single arrows from Lancaster to try out might be worth a shot, I was shooting the Axis arrows

 

[Bulldawg]

You’re probably on the line and I always like to go stiffer, I think you’re underspined. 300 ‘s will work good for you.


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[Trial153]

Probably a little weak. Back the limb bolts out a turn and you will be fine

 

[griffinit]

So if I lower draw weight to 65lbs would that correct this issue
e? Thanks

 

[elkguide]

I shoot 62#, @ 28.5" with a 29" - 340 spined arrow.

I think that you are underspined. If you do as Trials suggested and back out your limb bolts to lower your poundage, I'll bet that your arrows fly better. If they don't.... go to a "BETTER" bow shop and have your bow retuned.

 

[Trial153]

Yes lower draw weight or like can cut those shafts shorter as well.

For example i am 28 draw and yet i shoot 26 shafts out of all my bows, even with the larger fixed blade heads I use i have no clearance issues.

 

[WhiteOak]

I just had to exchange my arrows that were by the catalogue correct for my set up after going back to the shop to paper tune.

Originally I took my bow in to get restrung and I was going to buy a dozen arrows in more appropriate weight and straighter than what I had been shooting. According to the setup I wanted we went with beman defender elites and by the mfr chart I was safely spined at 340 so I ordered a dozen. Went back to pick up my bow and arrows and tech told me we weren't going to paper tune until I shot in the string at least 200 arrows. Which is understandable set my 20 and went home. When I went back to paper time no matter what we did to the bow by the books of the tail low left tear even with the tech shooting it we got the same tear. Started trying shorter arrows in same spine to see if I could still use mine. Finally the owner brought out a 300 in a couple different arrows and i shot bullet holes. He said my particular set liked stiffer arrows. Thankfully he exchanged my arrows(only 6 as I had already lost 2 by the time I went back, getting too cocky with the wind). But I learned the lesson that I will try one arrow before I buy a dozen. Also the owner said he doesn't worry about paper tuning his bow too much he is more concerned on arrow performance down range but I want to know my arrow is leaving as efficiently as possible.

 

[RosinBag]

The spine charts are just to get you close; top weight and cam design can push you up one to two stiffer arrows.

The easiest way is take about five pounds out of your peak weight and try them to see if that works.

If you like the weight you are pulling now, cut about 1.5” off those arrows and it should give you nearly the same effect.

 

[2blade]

I shoot 28.5" 340's outta my 61@29 D340's, so yea, a 29" arrow is under spined. However, OT2 says if you cut that arrow to 27.75" with 100gr heads it would work. Awful lite tho, 370grs total weight. A 340 fmj would come in at 460grs, still moving at 284fps.

 

[griffinit]

Okay guys so next question. I'm dropping my draw weight to 65lbs, and checking results.

I'm shooting at 284 FPS, with a 401 Grain arrow/Tip setup. I hunt elk and deer, I hear most guys like to be closer to 425-475 Grains combined with tip? How should I achieve this?

Thanks!

 

[WYCFM1]

Cut 1” off shafts. stay with the 100g tips. Try shooting the shorter shaft at 70lbs before buying more arrows. If you ever plan on shooting heavier tips you’ll pry need a 300 spline arrow at 70lbs.


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[WYCFM1]

Those guys are using brass inserts.50-75g brass inserts that get you closer to 500. That’s a whole new discussion if you are picky about FOC.


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[WYCFM1]

If you decide to add weight up front to get closer to that 475g range your pry gonna need a 300 spline arrow to push it. I shoot 28.5” Easton axis 300 match grades at 10.7 gpi with 50g brass inserts and 100g broad heads. Just what my bow shoots good.


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[griffinit]

Yeah the weight of my arrow is like 381 Grains and has a 20 grain insert in the front already. I don't know what's too much.

Shot tonight bow tonight at 65lbs, arrow angles to the right before correcting itself.

 

[2blade]

Okay guys so next question. I'm dropping my draw weight to 65lbs, and checking results.

I'm shooting at 284 FPS, with a 401 Grain arrow/Tip setup. I hunt elk and deer, I hear most guys like to be closer to 425-475 Grains combined with tip? How should I achieve this?

Thanks!

28.25" axis 340, stock insert, 6gr vanes, 125gr head, 13% foc, 438grs total weight. Use a 9gr vane, 28.75" axis 340, 125gr head, stock insert, 12% foc, 451grs total weight.

 

[awildswanger]

Bringing this one back around

Hoyt XXL 32.5” Draw ~67.5lbs, shooting a 444 grain 300 spine Black Eagle Outlaw at 290fps. If I try bumping up from 100gr to 125gr points, would I be underspined? Or is that too small of an increment to change? At what change in point weight would I need to go from 300 to 250 or 200 spine?

 

[Marble]

Bringing this one back around

Hoyt XXL 32.5” Draw ~67.5lbs, shooting a 444 grain 300 spine Black Eagle Outlaw at 290fps. If I try bumping up from 100gr to 125gr points, would I be underspined? Or is that too small of an increment to change? At what change in point weight would I need to go from 300 to 250 or 200 spine?

Provide an arrow length and someone will check it for you.

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[Evol]

Bringing this one back around

Hoyt XXL 32.5” Draw ~67.5lbs, shooting a 444 grain 300 spine Black Eagle Outlaw at 290fps. If I try bumping up from 100gr to 125gr points, would I be underspined? Or is that too small of an increment to change? At what change in point weight would I need to go from 300 to 250 or 200 spine?

Not sure what your arrow length is but I put it in archers advantage and am getting underpinned with only 120 upfront (point + insert) and a 31 inch arrow for reference (30 was weak too)

 

[burns152]

Bringing this one back around

Hoyt XXL 32.5” Draw ~67.5lbs, shooting a 444 grain 300 spine Black Eagle Outlaw at 290fps. If I try bumping up from 100gr to 125gr points, would I be underspined? Or is that too small of an increment to change? At what change in point weight would I need to go from 300 to 250 or 200 spine?

Black Eagle's spine chart is based on 100gr points, so if you are going up in point weight you may be underspined depending on the length of your arrow.