Bowtech RPM 360 and pink Nockturnals

[BowTechExperience]

I've been fine tuning my new bow the last couple of weeks.. I feel that I'm about 90% dialed in. Shooting FMJ 400s with a 100 grain head at 60.19 lbs and a 28" draw. I do not know the speed of this setup as I don't currently own a chronograph. With the standard Easton nock I'm spot on center mass at 40 yards.

 

 

 

 

However,

 

when using Nochturnal nocks I seem to be loosing about 2-3 yards on my elevation or POI.. The following two videos were shot at  40 yards and while left and right is hitting exactly where I'm aiming, I'm low and I think it is because these nocks are a bit thicker in the string groove.

 

Has anyone had this issue with them hitting lower than your standard nocks?

 

This shot the camera was back with me at 40 yards

 

 

 

 

and here the camera was about 12 yards from the target

 

[BowhunterNJ]

Cool videos and nice looking setup!

I've heard of guys filing down knocks due to the tightness, I'm curious what others have to say about the tightness of the knock and any impact on POI.

Have you tried removing the battery/weight inside to see if it's not the weight that's influencing the lower POI?

That is the first thing that comes to mind for me, the weight over the tightness.

[BowTechExperience]

With the Nockturnals, the battery is not accessible. They are a sealed unit unfortunately.

[BowhunterNJ]

Hmmm, any way you can alter one of your standard nocks and add weight to match the weight of the Nocturnal?

Maybe fill the inside core with clay or something?

[BowTechExperience]

I was thinking of adding a bit of hot melt to the inside of the Easton nock to try to match the weight. The Nockturnal weighs 20 grains and the Easton nock is only 9 grains, so can it be that 11 grains is causing the drop?

Edited May 4, 2014 by BowTechExperience

[BowhunterNJ]

Oh wow, I can't see 2 grains making that much of a difference honestly, I was thinking maybe they were a good 10+ grains difference with the internals of the battery system.

Well I'd say you might as well tune with Nocturnals and shoot them at all times if you plan on using them, just to have that level of consistency added to your setup.

Just do less multi-arrow grouping to avoid damaging them.

[BowTechExperience]

My bad, the Nockturnal is 20 grain..

[BowhunterNJ]

In that case I would say 11 grains could make a difference and is worth trying to simulate if you want to use Easton nocks for practice.

 

 

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[redsquirrel]

Not sure if this was the question but since it came up, nock fit can definitely impact POI a bit.  If one nock is tighter than the other on the string that could factor into the discrepancy.  Are they both the same style nocks?  I.e. s, x, h?

[BowTechExperience]

Not sure if this was the question but since it came up, nock fit can definitely impact POI a bit.  If one nock is tighter than the other on the string that could factor into the discrepancy.  Are they both the same style nocks?  I.e. s, x, h?

Yes as in the sense that the Easton nock is an "X" nock and the Nockturnal nock is branded as an "X" nock but there is definitely a difference in string tightness and the Nockturnal is very slightly thicker on the tail end..

 

20 and 30 yards they are on but drop at 40.

[redsquirrel]

Yes as in the sense that the Easton nock is an "X" nock and the Nockturnal nock is branded as an "X" nock but there is definitely a difference in string tightness and the Nockturnal is very slightly thicker on the tail end..

 

20 and 30 yards they are on but drop at 40.

I would be less concerned about the tail end because I know that they are cramming the electronics in there and it is going to weigh more.. but the whole point of having them both be an "X" nock is to get the same nock fit.  If that isn't the same I would not use them if you are using X nocks for practice.  I would find regular/lighted that have the same fit.

[Matty]

The way the nock fits on the string definitely effects POI at longer ranges. I noticed it more when I would shoot out around 80-100 yards more often, but it certainly made a difference even among the same type of nocks. Occasionally one or two fit looser even though they aren't fractured, they would always shoot high. Try to get them to fit more consistent with the standard Easton nocks by filing whatever is hanging up.

 

The grain difference could be an issue too, but I have a feeling it has more to do with the tight fit on the string.

 

You could always rule out grain discrepancy first by doing something like what Matt said. Glue something into the easton nock to make it weigh the same, then shoot again. If there is still a difference, it has to be the fit on the string.

[BHC]

I really like BowTech, but I just have a problem drawing those cams back

[BowTechExperience]

Ok, I got home from work a little while ago. Grabbed one of my wife's emery board's ( a fine one, also can be used in a pinch to sharpen a blade if necessary ) and filed down the nock groove a little. The nock snaps gentler on the string and I shoot it at 40, but still low at 40 yards by the same amount.

 

 

I put the broad head on another arrow with an Easton "X" nock and shot it at 40... and it shot right in the middle.. Now I'm thinking it must be the Nockturnals causing the low impact for sure..

 

I grab a Rocket expandable and screw it onto the arrow with the Nockturnal and shoot it also at 40 yards and the damn thing shot right in the middle also...

 

I'm shooting a Slick Trick Magnum 100 grain head as my hunting head. I've been using them for quite a few years and they have always shot with my field points as long as my bow was tuned and I did my part. These heads have never let me down and always open up a nice wound channel. I guess that the Nockturnal  and the Slick Trick just don't get along. I cannot see myself going to an expandable just to use lighted nocks.

 

 

[BowTechExperience]

BHC, have you tried drawing the RPM 360 yet? It draws smoother than the Experience. What is your draw length and weight?  I've heard that over 30" draw they can feel aggressive. If anyone does decide to demo one of the Overdrive Binary Bowtechs, try to ensure that the cams are sync'ed properly as it will affect greatly how the bow draws and settles at full draw. In addition if I were new to one of these bows and going to demo one, I would recommend bringing your own hunting arrows when demoing the bow and chrono it with your arrow and not one of the "shop" arrows. I say this because sometimes a shop will have you shoot the bow with a light arrow to impress with the speed factor. These bows are fast and don't need cooked results to sell. They are shooter friendly, quiet, and quite honestly SEXY....lol

 

Also because they are a faster bow than most out there, you can shoot less draw weight and still get respectable speeds with them. The joy for me with these bows is that they are so simple to tune.

 

1. Set center shot straight down the middle of the shelf. I use the top limb bolt hole as a reference.

2. Set nock point 90 degrees to the string with the arrow running through the center of the burger button hole. 

3.Sync cams so that they are hitting the draw stops at the same time.

4. Shoot a bare shaft. For a right handed shooter, if it tears nock left, twist the top and bottom left leg of the split buss cable harness. Note: for every twist you put in the left side, you must take out a twist from the right to maintain cam sync.

5. If you get a nock high or low, double check your  cam sync, if they are solid and you are using a drop away rest, it may or may not be dropping fast enough.

 

This is my third Bowtech and all three have been a breeze to set up and tune.