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Discussion Starter · #1 ·
See below results of my BS shooting. Have shot several groups and get this result most every time. 20 yards. Shooting a Mathews VXR 31.5, right handed bow. Arrow rest is very close to center and arrow is very close to 90 degrees (horizon) to string. I have moved the rest left a bit but the BS windage displacement (about 4") doesn't go away. Vertical displacement is about 3", and I would like to make that go away too. Cams appear to be hitting draw stops at about the same time and back wall is hard. Question: is this something I can clear up with rest movement, or must I buy top hats? If I buy top hats, I assume I am moving both cams to the right? Any advice appreciated...THANKS
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It's not off to bad. I would shim the top cam to the right a little and it should be perfect. I had this exact same thing the other day. First I would put the rest back at 13/16 then move the cam. I don't think you'll need to shim both cams but you may.

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Shimming cams is a good idea for the horizontal flight. Another option is to play with DL. If you're a right handed shooter, this may get better by lengthening your DL a bit.
For vertical flight. Try advancing your top cam, your cans will be out of sync, but the BS flight will improve.
 

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Discussion Starter · #4 ·
Shimming cams is a good idea for the horizontal flight. Another option is to play with DL. If you're a right handed shooter, this may get better by lengthening your DL a bit.
For vertical flight. Try advancing your top cam, your cans will be out of sync, but the BS flight will improve.
Vertical flight: So, to advance top cam, I should take a twist or two out of the top bus cable (the front-most cable that rotates around the cam during draw cycle)?

Thanks for input.
 

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Hard to say without knowing the bow, even then, I look at the bow to figure out what's going to rotate the top cam a little more at brace. You want to twist the cable that rotates the top cam clockwise at brace. Try 1 full twist then draw, if top stop hits before bottom, you got the right canoe, if not, undo and twist the other cable.
 

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The first thing you might do is wrap the shaft with tape at the point of the fletching ,and about the length of the fletching matching the weight. I have seen it make some difference before. Sometimes it does not make that much difference, but I always do it now, just makes sense to match the weight. Could possibly be a slight spine issue too. The fletching dampens some of the oscillation of the arrow on takeoff.
 
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