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TUNING YOUR BOW
First off there are several different ways to get your bow/arrow combination shooting properly. This is how I tune my arrows to my bow, you may have a better or faster way.
I always bare shaft test my bow /arrow combination. I make sure my bare shafts are setup the same as my broadheads, as far as field point and broadhead weighing the same. I like to shot a bare shaft into a foam target at 25 yards or any other non-directional target will do. I also like to draw a big crosshair to help with alignment. At 25 yards the bare shaft has time to get out of paradox. I use several shafts because you will probably bend or break some if the spine is way off.
Arrow Selection Chart
Chart based on 125 gr. points and B-50 Flemish string.
Correct Arrow Length (1/2” over or under)
|
Bow weight at your draw |
27" |
28" |
29" |
30" |
31" |
32” |
|
35-39 |
1816 |
1916 |
1916 |
2016 |
2016 2115 2018 |
2018 2115 2020 |
|
40-44 |
1916 |
1916 |
2016 |
2016 2115 2018 |
2018 2115 2020 |
2117 2018 2020 |
|
45-49 |
1916 |
2016 |
2016 2018 2115 |
2018 2115 2020 |
2117 2018 2020 |
2216 2117 2020 |
|
50-54 |
2016 |
2016 2018 2115 |
2018 2115 2020 |
2117 2018 2020 |
2216 2117 2020 |
2216 2315 |
|
55-59 |
2016 2018 2115 |
2018 2115 2020 |
2117 2018 2020 |
2216 2117 2020 |
2216 2315 2219 |
2219 2315 |
|
60-64 |
2018 2115 2020 |
2117 2018 2020 |
2216 2117 2020 |
2216 2315 2219 |
2219 2315 |
2219 2315 |
|
65-69 |
2117 2018 2020 |
2216 2117 2020 |
2216 2315 2219 |
2219 2315 |
2219 2315 |
2219 2315 |
Carbon Tech Rhino Shaft Comparison:
35/60's are similar spine to a 2018
45/70's are similar spine to a 2216
55/80's are similar spine to a 2317
40/80 Carbon Tech Panthers Depending on how they are trimmed
Now your sight window is cut 3/16” past center and you will need to build it out a little if you like wood shafts. Just peal off the side plate leather and stick a piece of leather or wood approximately 1/16” thickness behind the side plate to bring it closer to center shot. This will allow you to shoot a lesser spine than if you leave it at 3/16” past center.
Your Brackenbury bow will probably shoot its best at 7-1/2" to 8" brace height so I'd start at 7-1/2". The Quest and Non-Typical brace is 7"- 7-1/2". A good starting point for your nock set is 5/8". So you are going to have check these measurements. Please see figure 1 & 2.
Start at 25 yards and shoot several fletched shafts at your target, holding your bow vertical don’t cant your bow now, this will give you shot reference. Now shoot your bare shafts holding your bow as vertical as possible. Check the entry of the bare shaft compared to your fletched shafts.
Note: This is for right handed shooters, Left handed shooters will be opposite
1. If the point is high and nock is low you’ll need to raise the nock point on your string.
2. If the point is low and nock is high you’ll need to lower the nock point on your string.
3. It is possible to have #2 if nock point is way to low, causing it to bounce off the shelf.
4. At this point get your side plate and nock set as close as possible, don’t worry if it isn’t perfect yet, spine will effect the impact also.
Now let’s work to get the spine right for your arrow/bow combination and your shooting style, every shooting style being different.
Note: It is important that you are fresh and not tired when doing this part of tuning. You’ll need to be as constant and accurate as humanly possible.
I use several different spine bare shafts all cut to the proper length or you can cut longer shafts down 1/2” as you go to achieve the same results. I just hate doing it that way, but it does afford you a rest period so you don’t get tired.
Again shoot your shafts at 25 yards until you find the proper spin shaft.
1. If the point is left and the nock is right your shaft is to stiff. You need to pick a lighter spine shaft.
2. If the point is right and the nock is left your shaft is under spine. You need to go to higher spine shaft or cut your shaft down 1/2”.
3. At this point your shaft should be entering the target the same as your fletched shaft if not keep repeating all steps.
4. If your spine is very close you can change your brace height slightly to fine-tune it. Higher brace will stiffen the shaft and a lower brace will weaken the shaft.
I personal like my nock point to be where the bare shaft hits the target, a little nock high than the fletched shaft. I then move close to the target, just far enough back so the shaft clears the bow, and shoot the fletched arrow. I’m looking for feather bounce, so if the arrow nock is high and not dead straight then you’re getting feather bounce. Now is when I rotate my nocks to get it as close to being perfectly straight into the target as possible.
Once I have everything perfect I write down brace height and the setting for my nock point on a small label and stick it on the lower bow limb. If you can’t get absolute perfect flight I’m sure you will be a lot closer than your hunting buddy. Now it’s time to shoot your bow in your normal style and have fun. The confidence that your bow shoots were you point it will be the best feeling and your groups will shrink.
Proper arrow tuning and good form will produce 5 arrow, 25 yard groups like this with your new Brackenbury Custom Bow!!