Arrow spine

[gesthuntn]

What spine arrows would I need to shoot in my Old Mountain Mesa long bow? Draw weight is 40 lb at 28in and I pull 28in. I'm looking for thoughts on carbon and wooden arrows. Wanting to shoot broad heads between 160 and 200 grain.

[BAK]

I'd suggest a test kit with .600 mid range.

[slowbowjoe]

For wood arrows, I'd say 45/50's, 29" BOP, with 160 points would be a very good bet.
For 200grn points, maybe 50/55's, starting out 29.5 BOP should be close also. I shoot 40-45#s, but don't go more than 145grn for my broad heads.

Keep in mind that higher spined shafts will usually be heavier than lighter spines, and combine that with a 200 grain point and you're going to end up with a very heavy GPP (grains per pound weight), and the trajectory that goes with it. I know some folks are fine with that, just an FYI.

[Fletcher]

Not sure how deep the shelf is cut on a bow but suspect it is cut to center.  I'm shooting 43 lb on a Toelke Chinook that is cut to center.  With 28" BOP and a 200 gr point, it tunes perfect at 61 lb spine.  With a 160 gr it likes 55-57 lb.  I shoot Douglas Fir shafts from Surewood Shafts and try to keep my total arrow weight around 570-580 gr.  With your 28" draw, you'll probably cut your arrows to 29" BOP and will need to add 4-5 lb spine.  A good set of test arrows is the best way to find the best spine for your setup.  They need to be marked with the actual spines, not just the 5-6 lb range.  With range sorted test arrows you never really know what spine you are shooting.