FOC problem ?

[SS Snuffer]

I shoot a Kanati longbow have for many years and many deer. I shoot a 30" CenterShot 600 arrow with 75 gr.brass insert 150 gr. field point FOC is 23%. I always shoot Five arrows , 3 fletched and 2 bare shafts with electrical tape in the the same location and weight as the fletching. Bare shafts hit 1-2" lower than the feathered arrows do at 20 yards but the tail of the arrow  always ends up HI ALLOT on the bare shafts. Like 35 degs.
 Tried moving the nock lower from 5/8 in small amounts down to level with no luck. Bare shafts seem to fly perfect until about 4 yds from the target and than the point drops. I move up to 15 yds. and they straighten out ok.
 Tried different target materials Hay foam all the same. Is this a form error or a FOC quirk.
Anything I can try?

[Tomas Stieber]

I think your FOC maybe too much, try smaller head.

[Wheels2]

I still have not gone to a high f.o.c. setup.  I run 125 and 175 grain tips with just the standard inserts.  I like a heavy arrow, but don't worry about f.o.c.
Given your arrow spine, I suspect that you are not shooting a lot of poundage or a high effeciency bow.
I would also try lighter tip weight.

[McDave]

I've had similar problems with a persistent nock high, and quite often it has been caused by shelf bounce, or false nock high.

If you use a split finger string grip, false nock high can be caused by pressing down excessively on the arrow nock with your index finger at full draw.  The solution is to lower your string elbow until you are pulling straight back on the string and have no excessive downward index finger pressure on the nock.  Or, the index finger pressure may be caused by excessive use of the arm muscles, in which case you need to learn to draw with your back muscles and relax your arm and hand muscles.

If you use a 3 under string grip, false nock high can be caused by having too low of a nock point.  You mentioned that you started at 5/8” and worked your way down to level with no results.  It may be that your nock point should be higher than 5/8”, even 7/8” or 1” is not unusually high with a 3 under grip.

Or, you could be bouncing off the electrical tape.  If all else fails, try removing the tape and see what happens.

[BUCKY]

I shoot 3 under and my nock is 3/4

[SS Snuffer]

You nailed it Dave!
 I was having a draw shoulder problem and was told a hi elbow draw was easier on the shoulder. Once you said arm straight back I realized what the problem was and I also went to a old "no pinch" tab I used awhile ago (I shoot split fingers). Made all the difference in the world, THANKS so much.
Been fighting this problem for weeks! Thanks again

[trad_bowhunter1965]

I have been told that nock high is caused by high FOC. 

[Friend]

Would suspect arrows are not properly tuned.

Have no issue bare shaft tuning EFOC arrows up to ultra EFOC ...often bare shaft tune them out 40 yards.

[Wudstix]

With woodies I just put 160-190 grains on front of 650-700 grain tapered footed shaft and call it good.  Been throwing arrows from same bows for years.

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