Have a question and everybody’s opinion is welcome.

Shooting my 61@29 Bighorn td. Arrows are 2117s and 2315s. Alll are 30 in with 125 gn points. Only diff is 2117s have 4 in feathers and 2315s have 5 in.

2315s consistently hit right of 2117s. Shooting right handed

How does this happen? What the heck am I doing wrong?

MP

Good question considering both shafts are only a tad different in GPI according to Easton website. The 2117 is a tad heavier but it is also a smaller diameter. Wonder if the diameter has anything to do with it?

My guess is the tail of the 2315 is making contact with the sight window on the way out, kicking the tail left and the point right.

There's a huge difference in spine between those 2 shafts.

That’s what’s confusing me. Smaller diameter and softer spine should be hitting to the right. I figure it’s something I AM doing.

MP

In reference to fdp. To my eye, the 2315s have perfect flight to the target. Sometimes the 2117s wobble a bit.

MP

Hard to say without knowing more about how you shoot. If you aim/shoot the center of the arrow then the larger diameter would require you to move the bow hand further to the right to get the same sight picture with the same sideplate build out.

Any arrow CAN have perfect flight, and youcan even get arrows of incorrect spine to group bare and fletched together. The issue is the group is in the wrong place.

The 2315's are 92'ish pounds, so once the clear the string they shouldn't wobble much because they never bent much to begin with.

Something else about this. I shot 2315s for years out of this bow, with good results. A couple of yrs ago I tried the 2117s because I had a few and the bow I used to pair them with broke.

When I first shot the 2117s, they hit to the right!

MP

Shooting off the shelf? Do you have it raised for minimum contact both on shelf and plate?

This bow has always had a rug rest and leather side plate. The shelf is well rounded but has no raised bump.

MP

Is it just me, or does it sound like maybe it’s time to strip off a few fletchings?

One thought, though... If the results are different, then something has changed. I would probably begin by checking your brace height.

But on the other hand.... do you think you really care?

FWIW, I just ran your specs through Stu’s calculator, and it would appear that actually you’ve got a stiff arrow and a weak arrow nearly 20 pounds apart.... and your bow probably wants something right in between.

You might well be able to get tuned with either arrow, but IMHO you’re not ever going to be able to shoot those well-tuned AND interchangeably unless you’re just OK with covering up a big spine issue with those 5-inchers; I was happy enough doing that for a long time.... until I saw how much better I can shoot when I’m not fighting the tune every step of the way...

2315 is spined 92.1# and 2117 is 77.4#. I would imagine that 2315 is way stiff for 61# bow and 125 grain tip. I use them for 71# LB and 190 grain tip, just fiddling with arrow length for best grouping. @30” seems right - 28 1/2” to back of bow at my draw. Probably no help!!!

2216 at 83.8# spine might work.

If memory serves me right a 2312 is the ultra light for the 2117 and the 2315 is the light for the 2119. DANNY

The term light and ultra light refer to mass weight for arrows of similar spine, though different diameter and wall thickness. DANNY

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