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Old 08-04-2019, 10:32 PM   #1
mikeyb_23
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I got some fmj 340s headed my way. They will be 28" long, hoping to put a 50 grain insert and then 100gr broadhead. I'm shooting a Obsession FX7 at 65lbs, at least because it's maxed out. Will the insert make me under spined? What kind of speed should I expect? The arrows run 11.3gpi, should ot me right under 500gr.
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Old 08-05-2019, 01:27 PM   #2
Stoof
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What year is your bow? I can't find it in my program.
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Old 08-05-2019, 01:30 PM   #3
mikeyb_23
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2019
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Old 08-05-2019, 01:37 PM   #4
Stoof
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Dang, not in my database. I only have through 2018.
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Old 08-05-2019, 03:18 PM   #5
mikeyb_23
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Thanks for looking
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Old 08-05-2019, 03:21 PM   #6
TexasArchery_27
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Out of all the spine programs I've tried, VAP's on their website is the most accurate. Bareshaft tested with 3 diff spine arrows and 2 bows ranging from 55-72 lbs.
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Old 08-05-2019, 03:24 PM   #7
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I got a suggested spine of .300, your spine would be almost to 340 @ .333 ideal.

Should work out, arrow will be a little weak I believe though. If you were to drop draw weight to 63lbs at 27" draw I think you'd be right on.
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Old 08-05-2019, 05:46 PM   #8
mikeyb_23
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Maybe I'll just use a reg insert then. Just wanted to up my foc a little.
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Old 08-06-2019, 09:50 AM   #9
TexasArchery_27
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I got some of this advice from Troy @ Ranch Fairy, and it's helped tremendously: buy a test pack of field tips in various weights (15$ or so) to bareshaft tune and see what the limit would be for 340's. After that, if it's a little underspined, buy bare shafts in 300 spine from Lancaster Archery (about $30 with shipping). This will be the cheapest method, and much more accurate than any calculator. It's a little more time consuming, but well worth it in the end.
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Old 08-06-2019, 10:20 AM   #10
jds247
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If you are looking to up your foc look at gold tip velocity arrows . I'm running 50 grain inserts and a 125 grain head .. you may be able to cut the 340s an inch shorter and make them work. V a ps site..
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Old 08-06-2019, 02:08 PM   #11
QACZ71
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Should be able to tune the 340’s, but as previously stated you will be on the edge of underspined. My 6mm 340 Axis with 50gr inserts shot great when my Triax was at 65lbs. When I cranked it up to 70lbs I would get some left and right variations past 50yds. Think they were going around 285-287, at least that where I landed on sight tape never sent it through a chrono. Will be slower due to the heavier arrow.

Last edited by QACZ71; 08-06-2019 at 02:10 PM.
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Old 08-06-2019, 04:24 PM   #12
Stoof
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Iím shooting FMJ 340ís cut to 27 1/4 with the HIT insert and 125 gr heads. 65 pound draw weight at 28 inches. Total arrow weight right at 495 and they fly like darts.
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Old 08-06-2019, 08:05 PM   #13
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Quote:
Originally Posted by Stoof View Post
Iím shooting FMJ 340ís cut to 27 1/4 with the HIT insert and 125 gr heads. 65 pound draw weight at 28 inches. Total arrow weight right at 495 and they fly like darts.
We have the almost exact same setup then. How much does your vanes weigh and hit insert? I was guestimating 495 with a 50gr insert.
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Old 08-07-2019, 12:18 PM   #14
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The factory inserts weigh 16 gr and I am running four fletch blazers. I believe they are 3 gr apiece.
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Old 08-08-2019, 03:11 PM   #15
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I sighted in my bow with the new arrows last night. One already had no fletchings so I thought I would fling it with them. I shot it twice and both times it hit with the nock kicked way right. What does that mean? This was at 20yds.

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Old 08-08-2019, 03:16 PM   #16
TexasArchery_27
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I think it's one of the three

1.) Arrow spine is too stiff
2.) Rest needs to be adjusted left or right. Move it around until the arrows start going in straight. Look from behind the target and make sure the bare shaft points to where you took the shot
3.) Needs to be nock tuned. Turn the nock and see if it helps at all
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Old 08-10-2019, 12:05 PM   #17
jds247
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Quote:
Originally Posted by mikeyb_23 View Post
I sighted in my bow with the new arrows last night. One already had no fletchings so I thought I would fling it with them. I shot it twice and both times it hit with the nock kicked way right. What does that mean? This was at 20yds.

Sent from my SM-G955U using Tapatalk
Try turning the knock a quarter turn and shoot it again . Repeat until its close.. I knock tune all my arrows before fletching . I didnt believe it worked until I tried it .. made a big difference when shooting out past 60 yards ..
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Old 08-10-2019, 08:49 PM   #18
mikeyb_23
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Quote:
Originally Posted by jds247 View Post
Try turning the knock a quarter turn and shoot it again . Repeat until its close.. I knock tune all my arrows before fletching . I didnt believe it worked until I tried it .. made a big difference when shooting out past 60 yards ..
It worked, almost. It did help out, but still has a little bit of kick out to it. Maybe cut it down by half.
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Old 08-10-2019, 11:06 PM   #19
jds247
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Quote:
Originally Posted by mikeyb_23 View Post
It worked, almost. It did help out, but still has a little bit of kick out to it. Maybe cut it down by half.
You may need to do a little more rest tuning .. I do the modified French tuning then bare shaft tune at 20 yards.. I'll defer to the guys that know more about tuning than I do..
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Old 08-14-2019, 06:40 PM   #20
OneShotShooter
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It should be fine
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Old 08-14-2019, 06:40 PM   #21
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Don’t get too technical with the equipment is my advice
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Old 08-14-2019, 07:23 PM   #22
EHenry1217
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Need to do an estimated FOC then take that into consideration. You can have two arrows weighing the same with one that has higher FOC and it will need a stiffer spine. Out of both evils I’d rather be over spined then underspined. They are more forgiving. I hope that helps
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