Nock left...form issue or other?

[elkbreath]

I just bareshaft tested my arrows to my new bow.  I am shooting full length trad hammerheads with brass inserts. I cannot remove the inserts any more.  It's a Right handed  76#@29.5 Rd longbow.  

Right now I only have a 125 gr head in.  

Bare and feathered are grouping very close at 23 ( all the room I have).  

However, the bare is def flying nock left the whole way.  Fletched look perfect.  

Any fine tuning ideas from the gurus to get the bare flying more straight?  Thx. Dan

[Shedrock]

Sounds like a tad weak in spine. I would go with it if the fletched shafts are flying perfect. I never bareshaft tune, I only shoot woods and do a little paper fine tuning.

[JimB]

Well,you can't really drop point weight.They sure sound weak and I can't remember if those shafts can be cut from either end? If the rear could be cut,I would trim a little there on the bare shaft and try again.If you can't,you could try knocking out the insert by inserting a drill bit at the rear and swinging.If it won't come out,I would be tempted to cut that end of the shaft off,insert a new insert and try again.You may need to go up in point weight at that time but there is a wide variety above 125.Anyway,good luck with it.

[elkbreath]

Thing is these arrows are supposed to handle draw weights to 95, I have a hard time wrapping my mind around the idea that they are weak.  I shot a 145gr head from a heavier bow...?  Think I'll let it ret

I might have a 100gr head around here...   I really want them to be 200!

[Orion]

Elkbreath.  I agree with you. One other thing you might try to make the arrow act stiffer, and I'm not convinced that is the problem, is to use a little thicker strike plate.  Could just build it up with tape to test.

[kawika b]

Play with your brace height yet?

[Bjorn]

It is a tad weak-which in my mind is about perfect-allows for the fletching to take effect. And you are back far enough at 23 yds.

[iohkus]

X2 Bjorn  

[Terry Lightle]

Think Bjorn nailed it

[Bladepeek]

I'm seeing the same thing with some carbons I just got. I got some CE150's and with my 44 - 45 lb bows, I had to cut them all the way back to 30 1/4 with 125gr heads before they quit sliding in nock left(as in REALLY nock left!). I think a lot of the spine estimates are based on 27 - 28" arrows. I bought some CE250s that head 100gr brass inserts epoxied in. I started cutting them back at the nock end for my 50# recurves and had to go all the way down to 30.25 again, with 145 gr heads. I plan to shoot 160gr Zwickey's, so they'll be fine when fletched, but I'm sure glad I don't draw 31" like some of you. I'll bet its really tough to get an arrow stiff enough to handle a heavy point if left full length.

What in the world do you guys do who draw 31" and shoot 60# + bows?

[Looper]

Why can't you remove the inserts? I shoot full length hammerheads out of my 64@31" bows. I use the stock aluminum inserts and 200 grain heads for a total of 700 grains. I tried the brass inserts, but I had to drop down to a 125 grain point for them to work for me.

[Bladepeek]

Yeah, that's what I'm finding too.

Those brass inserts are pretty darned long and are epoxied in. I have some lying loose so I'll check the length and if I have that much extra shaft, I'll cut them off behind the insert. Those are bare shafts, 30.25" that are flying well with 145 points, so I'm sure by the time I put 3 5" feathers on, they wil stabilize nicely with the 160 gr Zwickey's.

Just surprises me that a CE250 or GT7595 has to be cut back so short to handle a heavy point out of just a 50# bow.

[The Whittler]

Put a broad head on and see how your feathered arrows fly.

[elkbreath]

Whittler
, I would but that's why I'm tuning, to know which head to buy!  

Wow long are the brass inserts?  I draw 29.5".  Any chance there's enough arrow for me to cut to 30"?   If full length is 32 and I cut 2 inches off, would that be behind the insert?

[Orion]

Some 100 grain brass inserts that I have are 1 7/16 long with 5/16 of that serving as a collar that protrudes beyond the shaft. That means there's 1 1/8 inches of brass inside the shaft. Good luck.