I am trying to tune my new bear take down , B riser with #3 limbs 45@28 , I draw 30” so I am at 50lbs @ my draw length according to my scale. I like a min of a 31” arrow and I use 125gr tips standard 14gr insert and Flemish twist fast flight string, I have several brands of 500 spine arrows on hand. 3 rivers recommended I stay with a 500 spine arrow, all the charts I look at recommended border line between 400/340 spine arrows. I have been testing some gold tips 500 spine, I cut them down to 31 and the bare shaft is still reading weak, I can visible see the arrow flying sideways in flight, fletched arrows seem to do ok. I have a 1/2 Dozen 500 black eagle vintage that 3 rivers said they would swap out since they are unused. I have played around with their spine calculator and it Varys between 400 and 350 as well, as does gold tips. not sure why 3 rivers recommend 500 spine arrows. What do y’all think? I have no 400 or 340 arrows on hand to test.

I always go by what my arrows do when fletched but I think some archers will vary when it comes to spine.
My son uses a heavier spine than I do, depends on release, ect.

May be that you need a 400. If you could find a store that sells just 1 shaft, that's what I would do...see how the 400 does.
With the full length shaft and ff string, the 400 may be the spine you need, I certainly wouldn't think anything stiffer would be necessary.

I'm shooting 600 G Tips with total of 175 grain point, with a 29 inch arrow on 45 lb recurve with a ff string. I can shoot 500s but I have to leave the shafts 30 inches and bump up the point weight to about 225 or so.
I think Lancaster Archery will sell just 1 shaft, or maybe Big Jim's Archery.

I would try a 400 spine, I cannot imagine that rig needing a 340 spine.

just to add to the confusion I shoot a Bear TD 60" and 52#(B riser) and I shoot GT 35/55s cut to 30", 200gr point, 100gr brass insert and they bareshaft like darts. Very high FOC. 570gr arrow total.

Do you have some lighter point you could put in the 400's? By lowering the point weight, you increase the spine of the arrow. If a 75 or 100 grains point does indeed stiffen the arrow and it want to use 125 grains up front, then you would know that you need stiffer arrows.

one additional problem to keep in mind is total arrow weight when putting carbon arras together because the shafts are so light. I like to stay around 10-12 grains per pound of draw weight.

Walmart will sell you one arrow, if they have the sizes you want to try. FRED , what broad head are you shooting that weights 200gr ?

Thanks guys, y’all are spot on, I think I’ll pick up a 400 spine arrow just to mess with until then I wil swap out the 125 gr tip for a 100 and see how that does but as Fred said I am having trouble getting the arrows up to the. 10gr per inch I want to shoot.

160gr STOS and a 40 gr screw in adapter

I also shoot a 180gr screw in German Kenitics a lot

Cool Boker, keep us informed on how you are progressing.

With that draw length and weight you’re going to have a hard time making 500s work. I would even say at that length arrow you’ll have a tough time with 400s but it would be doable with a little effort. I’d look more at 340 with a 125 and might actually buy some extra tips in 145-150 to test.

The Traditional Gold Tips weigh more so you have that option to keep the weight up.

Bug Jim sells the GT blems.

If you are pulling 50# I would definitely up my point weight. If you are trying to shoot less weight up front because of speed. You are shooting traditional for the wrong reason.

I’m. Very suprised 3 rivers didn’t recommend a test kit. I never fletch my arrows till I get them hitting correctly.

Don’t rush tuning your bow. There are some days I just have to put it down I get so frustrated.

This is a pretty helpful chart that I used when I first started