Arrow spine help

[Rodriguez7]

How's it going, I'm having a little trouble tuning my bow. Thinking the arrows are to soft spined, not to sure. Currently, shooting a black widow psa, draw around 27 inches, at around 55 pounds. Currently running gold tip pro hunters, 400 spine, full length, around 32 inches. 175 grain heads, with  3 rivers archery inserts, the heavier ones, total weight is around 720 grains. Started with the lighter inserts, with a total weight around 640 grains, figured it was to light and bumped the weight. So my problem seems to be grouping. The arrows seem to whip and wobble quit a bit off release, are my arrows to long, or my spine to soft? I'm having a hard time keeping my group tight at 20 yards, and I'm pretty sure it's not me. Thanks for any help

No way to accurately answer your question. You need to do some form of tuning, like paper tuning or bare shaft tuning, and let the arrow tell you if it is stiff or weak.

Just guessing though, I would say a full length .400 with 275gr up front is going to be weak from a 55# bow. But not knowing anything about the bow or its centercut measurement, that is totally a guess!

Bisch

[9 Shocks]

I would guess your arrows around 29-29.5 inches would work better.  Widows are cut passed center and generally require a stiffer arrow.  I'm assuming youre spine is weak but like Bisch said, hard to accurately answer.

[Rodriguez7]

The bow is tillered for 3 under, but I'm still trying to figure this stuff out. I'm gonna have my bow shop fletch some gold tips in a 500 spine, at 30 inches and see how they shoot.  And the inserts I have are the full length tube type.  I was under the impression that they don't affect spine as much as head weight. Not sure though.

[Rodriguez7]

I'm loving shooting a recurve much more than my compound, and have an elk hunt coming up mid September. Trying to get it dialed in as much as possible. Thanks

[Pine]

500s are a weaker spine . I think you are going the wrong direction .

[Rodriguez7]

So what would you suggest, staying with what I have, and cutting them down a little? They're right around 32 inches right now.

[Orion]

Yes. Cut them down a lot.  If you draw 27 inches, you don't need more than 28 inches BOP.  Cut one to that length and see what happens.  Or, if you want to be conservative, cut the first one to 29 inches BOP.  It will stiffen up the arrow's dynamic spine a lot.

[Rodriguez7]

I'll try that first off thanks.

[M60gunner]

If that is a BW I would look at the YouTube vid on how Ken Beck tunes carbons to his BW. He explains it well enough and in regular folks terms. I even understand him.

[Shadowhnter]

X2 on listen to Ken Beck.

[katman]

Strip feathers off one shaft and shoot it bare, if its weak it will hit right (right hander) of the fletched.

Here is a good explanation of it.  http://www.acsbows.com/bareshaftplaning.html

[MEsquivel]

I have a similar draw length and weight.
I use a 55@26" recurve and have the same 175gr point +100gr insert in my goldtips.
I need to check the length, but I think my arrows are about 27.5-28".

[Rodriguez7]

I had my arrows cut to 29 inches today, I'll give them a shot when I get my inserts from 3 rivers.

[Rodriguez7]

Ok, so I had my arrows cut down to 29 inches, added weighted inserts, 50 grains, put in the tube inserts, and my 175 grain tips. Total weight is right at 720 grains, seem to be shooting much better. I'll shoot a few strings today, and see how they do.mfrom what I saw last night, they're shooting much straighter, and hitting the target straight, where the others were angled on impact. So it should give me around a 25 percent f.o.c. Maybe a little more, I just got the 50 grain glue in inserts yesterday, they seem to help.

[elkhunter45]

29" with 225 up front seems more like it. I shoot 29" GT Trad 400's with standard inserts and a 300 head out of a 50# @ 28" Bear Kodiak Hunter. My set up will bareshaft the bullseye at 20 yards and it is a much less efficient design than your widow. Hope you find your sweet spot.

EH45

[Rodriguez7]

Thanks man, I'm getting there. Been working a lot, so not much time to shoot, but my hunt is coming up quick!