Can I please get a look over from some more experienced folks using this software? I’ve done a few runs with the trial version trying to get my spine correct, as I’m planning on ordering some heavier arrows for Elk hunting. Shooting a Helim, 65lb, 27.5″ draw, 28″ arrows (carbon to carbon).
– I’m struggling with getting a good output. At 65lbs, 400’s are too weak (Easton’s arrow selection charts say go with 400’s up to 66 lbs), 340’s too stiff. I can get the 340’s right on the money if I use the brass HIT insert, slightly stiff at 50grains, 75 grains puts it right in the green. Am I using this correctly? If so, I need a superweight arrow to shoot 340’s/increase draw weight, or I need to turn my poundage down to shoot 400’s, without brass inserts. FOC looks way better with the 340’s and brass inserts.
– Not sure if I need to add the grub & monkey tails? Are these included in IBO rating? I didn’t find an answer searching for that.
– I’m shooting Easton Flatline DOAs, 400 spine, 100 grain tips, 3 blazers, and the microlite nock – this chrono’d at 291 fps. (These arrows are underspined according to the software, which makes sense – without helical fletching they impact right of field points). I read on some other posts here that I should adjust the performance factor so the calculated velocity matches what I chrono’d. I did this and settled on -11 to generate the results below.
– If this is ran correctly, what’s your opinion on the best combo here? I like the weight of the FMJs, but the regular Axis 340 with the 75gr brass HIT insert seems to be the best option, retains a little more speed, and still up over 78 on KE.
If these pics don’t expand so you can see the #’s when you click on them please let me know and I”ll insert the full size ones. Thanks for anyone who’s willing to help, I’m trying to learn a little more before I buy arrows this time!
Without even looking at your charts, a few questions and comments arise. A stiff arrow is always better than weak with broad heads. I would definitely go with a 300-340 spine rating.What hunting arrow do you want to use? Flatlines aren’t really a good choice, they are too light. Fixed blades or mechanical? If you are looking for good f.o.c., you can always go 125g. on the broad head.
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Yep that makes sense, thanks for the reply. I have OT2 set on “hunting” which I understand to mean it gives a slightly stiffer spine as ideal. Sounds like being even stiffer than “ideal spine” is ok, I know I’ve read that on here regarding the Helim previously. I’m using 100gr slick trick mags, 4-blade fixed. I’d like to use the FMJ, replacing the Flatlines for just the reason you brought up – they are way too light.