Kodiak T.D and arrow spine?

[Charlie Lamb]

Ok, I've been keeping my mouth shut about this for too long. I've got a really nice bow sitting on the rack and I want to shoot it but getting the right arrow is an issue.

Here's what is going on. I've got a brand new Kodiak T.D. phenolic and bubinga "B" riser. I put a pair of limbs on it that make a 64"bow at 55#. It draws smooth as butter and has real good speed.  It shoots a 2016 about a foot left at 10 yards. It should shoot them great.

If I put those limbs on a magnesium "B" riser I'm busting nocks at the same distance. Whatever distance I shoot the arrows are on the money. I can even shoot 2018's with the same results... from both risers. What's up. 

[ksbowman]

Charlie, Isn't the B mag more center shot than the wood handle B? I had the same thing with my wood B and all my mags both A & B shot fine. Also the spring on the side plate will act as a Berger button and will be more forgiving on spine.

[Kelly]

Charlie, lay the handles on top of each other lining up the takedown connections. You will find the shelf is higher on the B Mag. This shelf distance difference throws off the tiller, especially if you are using older Grayling limbs.

[Charlie Lamb]

Ben... I built out the arrow plate on the Mag and there's no spring on either bow.

Kelly... thanks I'll check that out.

[M60gunner]

Charlie, maybe you have hit on something here. But I see the difference with carbons not aluminums. I shoot 2114 aluminums from all my 55#@28 bows with same results. I will admit I shoot my Mag riser better than the wood one. In my case the Mag risers slimmer grip may have something to do with that.

[Orion]

Charlie.  If I remember correctly, you have a pretty long draw length, about 30 inches or so.  You may have built out the mag riser side plate to proud of center (worth checking).  Regardless, I think the 2016s are too weak for the wood riser bow.

The wood riser is cut to center.  The newer bows also come with low stretch strings.  Put all of that together, and I think you should be shooting a spine in 70# range, or even higher.  The 2016s are about 60# spine.  The 2018s pretty close to 70#. That's probably why they shoot better out of the wood riser bow. 

 I have no idea why the 2016s are shootiing left though.  If underspinned, they should be shooting right.  Did you let your brace height slip on the wood riser bow such that the arrows might be slapping off the side plate?  About 8 inches is fairly standard for a 64-inch TD brace height.  I'm not sure about this, but i think an arrow that is underpinned by quite a bit might also fail to clear the riser properly, slapping it at some point as it passes and be deflected to the left (for a right handed shooter) giving a false reading.  Or, might you be shooting 2216s? We older folks sometimes get things mixed up.   

[MCNSC]

I too have issues getting good arrow flight off the shelf with my TD. A Weatherrest makes it shoot great. I just received a new riser and it came with the factory rest. I found building it out helps a lot. I don’t have another Weatherrest on hand or I’d put it on. Id rather shoot it off the shelf but looks like that may require different spine arrows.