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Help, my zero is dropping

Old 10-05-2002, 10:08 AM
  #1  
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Join Date: Feb 2003
Location: Perryville MO USA
Posts: 21
Default Help, my zero is dropping

Can anyone help me?

I am getting back into bowhunting after a few years away. I bought a new Bear Vapor 300 about 8 weeks ago from the local pro shop. They set it up w/ Beman ICS arrow and an NAP 2000 fall away rest. I started shooting at about 62# at a distance of 25 yards. After awhile (200 shots or so) I decided to increase my poundage to 65#. All of the sudden my groups dropped about 6-8 inches. I took it back to the pro shop and they said the string must have stretched. Stating it wasn't uncommon for the string to stretch at about 200-250 shots. So they adjusted my nocks and sent me on my way. After I got it sighted in again and kept practicing, I was shooting consistent groups of 2 inches or less.........except on problem.

My groups started slowly moving lower and lower on the target every two to three days, and I have to keep adjusting my sights each week or so. The pro shop checked my bow over, said the rest was fine, and then said "I guess the string is still stretching".

Is this normal? For the string to consistently continue to stretch? I don't remember having a problem with this when I bow hunted previously.

Is this to be expected? Or am I being given questionable advice because the pro shop just doesn't know what is wrong with my bow? I would appreciate everyone's help.
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Old 10-05-2002, 10:36 AM
  #2  
Nontypical Buck
 
Join Date: Feb 2003
Location: Heaven IA USA
Posts: 2,597
Default RE: Help, my zero is dropping

It is possible for a string to stretch, creep, or whatever label one wants to put on it, depending on the materials used to make it. Strings made from S4 or 450 plus have always served me well with little to no stretch. You should also keep an eye on your nock. If it moves up your point of impact will lower.

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Old 10-05-2002, 01:15 PM
  #3  
Typical Buck
 
Join Date: Feb 2003
Location: Arlington WA USA
Posts: 718
Default RE: Help, my zero is dropping

Before I installed my QT 4000, I was asking some questions of NAP. The following is a new FAQ that has not been added to the Online System yet. It sounds to me like this could have something to do with your problem too; the other suggestions are also valid.

Below is a troubleshooting review that will help you obtain maximum clearance and performance with the rest.

Troubleshooting

Cannot attain fletching clearance on the prong block or the prongs. This usually occurs from the rest and nock point being located too low or because of uneven nock travel.

Solution First determine whether the bow is a dual cam or solocam design. Some bows both dual cam and solocam designs are susceptible to nock travel issues. While any bow can be tuned regardless of nock travel, knowing what to do in those situations can often save much time and effort during the tuning process. For solocam designs, often the simplest solution is raising the nock point on the string from 1/16 to as much as 3/8. The arrow will no longer appear to be 90 (right angle) to the string. Instead, it will appear to be pointed slightly downward at the point. If the problem still occurs, start by removing the black prong block from the silver shaft on the rest. The 7/64 cap screw on the bottom of the block attaches the block to the shaft. Once the block is removed, each prong can be slightly extended by using a 1/16 Allen wrench to loosen and then retighten each set screw. This increases the height of the prongs slightly in the raised position. Consequently, the string nock must again be reset slightly higher to accommodate the extra height in the prongs. Depending on the bow and set up the arrow may or may not form a right angle (90) with the string.

For a Dual Cam design first determine whether both cams roll over at the same rate by contacting a local archery pro shop and asking for assistance. If the cams do not roll over at the same rate the bow will be very difficult to tune. Once cam roll over is verified and/or corrected, the set up instructions above should solve the clearance issue. If the problem still occurs, start by removing the black prong block from the silver shaft on the rest. The 7/64 cap screw on the bottom of the block attaches the block to the shaft. Once the block is removed, each prong can be slightly extended by using a 1/16 Allen wrench to loosen and then retighten each set screw. This increases the height of the prongs slightly in the raised position. Consequently, the string nock must also be reset. The nock point will be reset slightly higher to accommodate the extra height in the prongs. At this point the arrow should be 90 (right angle) to the string. If the problem still persists, slightly raising the nock point as in the above solocam design example will solve the issue.

Cannot clear the inside hen fletch on the rest pick up cable.

Solution
Bend the cable as it exits the pivot block. Using your finger or thumb, bend the vinyl coated metal cable over toward the cable guard. This creates a permanent set in the cable causing it to track closer toward the cable guard and further out of the way of the arrow path.

Hope this helps and good luck this season.

Cary J. Pickands
Technical Support Specialist
New Archery Products, Corp.





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Old 10-05-2002, 07:15 PM
  #4  
Nontypical Buck
 
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Join Date: Feb 2003
Location: Oh USA
Posts: 1,584
Default RE: Help, my zero is dropping

270bolt, what sight do you have? If it's a Trophy Ridge, the sight may be moving. Many people, myself included, have had that problem. Strings do stretch, but to a point. Then they should settle in and remain consistent. When you have the bow shooting well, measure everything. Nock point, distance from nock to kisser (if used), brace height, tiller. I mark my sight with a Sharpie to see if anything on it moves. I do the same on the rest. When you start hitting low, check your measurements and markings on the sight and rest. This should tell you where the problem is.

Phil.
"Could you guys be quiet, my dad's trying to shoot."
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Old 10-05-2002, 07:22 PM
  #5  
Fork Horn
 
Join Date: Feb 2003
Location: jackson new jersey
Posts: 301
Default RE: Help, my zero is dropping

The same thing happened to me the other day. My problem was when I drew, my peep slid up the string a little bit. I got it back to where it was, and tied it in a little better. MWX

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Old 10-05-2002, 07:24 PM
  #6  
Nontypical Buck
 
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Join Date: Feb 2003
Location: WEST PALM FLORIDA
Posts: 2,890
Default RE: Help, my zero is dropping

you changed the poundage on your bow and probably the tiller at the same time that will change the point of impact

If information provided by the members of this board have helped you please let us know .
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