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Importance of 3rd Axis Adjustment

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    Importance of 3rd Axis Adjustment

    First off, I violated a cardinal rule of bow hunting--always practice the exact shot you expect to take under normal hunting conditions. This violation cost me the recovery of my first bowkill deer. Worst yet, the shot I took on this doe was 5 inches back, resulting in a pass through gut shot. I feel absolutely miserable about the whole event and hope that this posting might prevent a similar outcome.

    Here's the setup: I'm 20 feet up a large oak in a hang-on with my feeder 14 yards line of sight from my location. A mature doe comes in on a string and offers me a broadside shot at 13 yards. I'm sure someone will do the math on this but my guestimate is that the angle of incline for this steep shot was around 60 degrees (which brings into play the relevance of the 3rd axis). I shoot and clearly see my arrow hit nice and low, right on the heart plane, but nearly 5 inches too far back. Retrieving the arrow, I confirm a gut shot. I wait nearly an hour to attempt the recovery and can only find trace smatterings of blood. A 6 hour grid search of the entire property yields nothing. I go and get my 18-1 Rhinehart and recreate the shot....I'm stacking my broadheads on top of fieldpoints, all nearly 5 inches to the right.

    That's when I learned a hard lesson about 3rd Axis adjustments. The videos below give a quick overview and how to make the adjustments to your sights. Having made these adjustments, I'm grouping dead center from the same elevated position.

    Apologies for the long post, but I feel compelled to share my experience in the hopes it could prevent a similar mistake.


    [ame="http://www.youtube.com/watch?v=CO_fa0bGwu4"]Understanding the Effects of 3rd axis - part 2.wmv - YouTube[/ame]

    [ame="http://www.youtube.com/watch?v=EUYuhOZTd34"]Leveling a Hunting (pins) Sight - part 5.wmv - YouTube[/ame]
    Last edited by mojorider; 10-22-2013, 04:47 PM.

    #2
    Sorry to hear.Sucks losing a animal.Lost one a few weeks ago.Use what you learned on the next one.

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      #3
      Good post!

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        #4
        Hmmmmm.......I too lost a deer this weekend and have never set my 3rd axis. I was 20 feet up but no video to confirm a shot location and it was pretty dark. I was concentrating on the shot rather than looking where I hit the deer. A loud THWACK and I thought I had a dead deer. Not one speck of blood.

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          #5
          Could have just made a bad shot. It happens! Shooting at a target and a live deer with all the adrenalin flowing are a whole lot different!

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            #6
            Originally posted by Daniel75 View Post
            Hmmmmm.......I too lost a deer this weekend and have never set my 3rd axis. I was 20 feet up but no video to confirm a shot location and it was pretty dark. I was concentrating on the shot rather than looking where I hit the deer. A loud THWACK and I thought I had a dead deer. Not one speck of blood.
            Hell you just cant shoot.

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              #7
              Originally posted by TheCracker View Post
              Could have just made a bad shot. It happens! Shooting at a target and a live deer with all the adrenalin flowing are a whole lot different!
              Good point, but when I was grouping them consistently to the right 5 inches on my static target, I knew I had a problem with my setup. I was almost 2 bubbles links off on my 3rd axis adjustment. Once I made those adjustments, I was back on target.

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                #8
                I'm sorry, but it takes a lot more than 20 ft up and 13 yards for the 3rd axis to matter.
                I would venture to say that less than 5% of bowsights with a 3rd axis adjustment are adjusted correctly.

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                  #9
                  Originally posted by rocky View Post
                  I'm sorry, but it takes a lot more than 20 ft up and 13 yards for the 3rd axis to matter.
                  I would venture to say that less than 5% of bowsights with a 3rd axis adjustment are adjusted correctly.
                  How about 20 feet up at 30 yards?

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                    #10
                    What in the world is a 3rd axis?
                    Been bow hunting from trees since 1985 and never heard of this and certainly never calculated it into a shot or sights

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                      #11
                      Originally posted by Ragin' View Post
                      Hell you just cant shoot.

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                        #12
                        Holy Crud!!! What a bunch of nonsense. Quick check. Find a spot. Set up a trarget at say 30 yds. Shoot three arrows at ground level. Record. Shoot three arrows from 10 or 15 feet up. Redord. See any significant difference. I never have. Bow hunting is getting as bad as Bass fishing.

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                          #13
                          Originally posted by flywise View Post
                          What in the world is a 3rd axis?
                          Been bow hunting from trees since 1985 and never heard of this and certainly never calculated it into a shot or sights
                          That first video has a much better explanation than I can articulate, but it's basically the relationship between the sight pin(s) and the horizontal
                          extension of the sight. When properly set the sight pin(s) will be at a right
                          angle to the sight extension at full draw. Think of it like the site housing as a door on a hinge,the door can swing toward you or away from you. It only comes into play on extreme incline (or decline shots).

                          Turns out my 3rd axis was way off, but when I took the shot I had centered the bubble on my level, actually causing me to cant the bow, pushing my shot right. Based on your avatar, if you're shooting traditional, you won't have this problem. For those of use who still have the training wheels on, sometimes this advanced technology can actualy be an impediment.

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                            #14
                            Originally posted by EdO View Post
                            Holy Crud!!! What a bunch of nonsense. Quick check. Find a spot. Set up a trarget at say 30 yds. Shoot three arrows at ground level. Record. Shoot three arrows from 10 or 15 feet up. Redord. See any significant difference. I never have. Bow hunting is getting as bad as Bass fishing.
                            Water Melon Red Super Fluke!

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                              #15
                              The amount for me at 20-30 yds and 20ft in a tree is miniscule. Draw put the pin where it goes and dump the string.
                              The 3rd axis comes into play on steep angled shots which is more of a western thing.
                              Few will hunt a tree high enough and shoot a far enough difference for it to matter in Texas

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