How To Adjust Obsession Bow Draw Length

Adjusting the draw length on your Obsession bow can be the difference between a precise shot and a missed opportunity. Whether you’re a seasoned archer or just starting your bowhunting journey, understanding how to fine-tune your draw length is essential for safety, comfort, and accuracy.

Many archers struggle with improper draw length settings, leading to inconsistent shooting, muscle fatigue, and even injuries. This article will walk you step-by-step through the process of adjusting your Obsession bow’s draw length, backed by expert guidance, real-world examples, and practical tips that transform the complexity of bow setup into a manageable, repeatable process.

If you’ve ever felt that your bow “just doesn’t fit right” or noticed erratic arrow flight, draw length could be the culprit. By learning how to measure, adjust, and test your Obsession bow’s draw length, you’ll experience improved accuracy, better form, and a more enjoyable time on the range or in the field.

The following guide draws on manufacturer recommendations, field-tested advice, and professional archery resources to ensure your draw length adjustment is done safely and effectively.

Key Takeaways

• Proper draw length adjustment is vital for accuracy, comfort, and safety with your Obsession bow.
• Most Obsession bows use a modular cam system that allows tool-free or Allen wrench adjustments.
• Measuring your personal draw length is the first critical step before making any hardware changes.
• Real-world examples show that fine-tuning draw length improves consistency and reduces fatigue.
• Always test adjustments with real arrows and, if possible, consult a certified archery technician.
• Use manufacturer manuals and reliable sources like Obsession Bows Official Site for specific model information.

Understanding Draw Length And Its Impact

Draw length is the distance from the grip’s deepest point to the string at full draw, plus 1. 75 inches. This measurement determines how far you pull the bowstring back and directly influences shooting posture, arrow speed, and accuracy. An incorrect draw length can lead to poor anchor points, muscle strain, and erratic arrow flight.

The Science Behind Draw Length

A bow set to the correct draw length allows for:

• Consistent anchor points: Ensuring that each shot is repeatable.
• Optimal power transfer: Maximizing arrow speed and energy.
• Improved accuracy: Reducing strain and promoting proper form.

For instance, an archer with a draw length that is too long may overextend their shoulder, leading to instability and reduced accuracy. Conversely, a draw length that is too short can cause the archer to “chicken wing” their elbow, again impacting consistency.

Manufacturer Recommendations

Obsession bows, like most high-performance compounds, are designed with adjustable cams that cater to a wide range of draw lengths. Always consult your owner’s manual for specifics, as cam systems and adjustment mechanisms can vary between models and years.

Case Example: The Impact Of Incorrect Draw Length

Consider a target archer who persistently shoots left of center. After measuring, they discover their draw length is set one inch too long. After adjusting to their actual measurement, their groupings tighten, and their fatigue decreases significantly, a testament to the importance of getting this setting right.

Tools And Preparation For Adjusting Draw Length

Before making any adjustments, preparation is key. Having the right tools and setting up a safe work environment will streamline the process and reduce the risk of damage to your bow or injury to yourself.

Required Tools And Materials

• Allen wrench set (usually 3/32” or 7/64” for Obsession bows)
• Bow press (sometimes required for cam module changes)
• Measuring tape
• Owner’s manual or access to the Obsession Bows Official Site
• Paper and pen for notes
• Safety glasses

Pro Tip:

If you’re unsure about any step or lack the proper tools, visit a local archery pro shop. Certified technicians can perform adjustments quickly and safely, often while you wait.

Preparing Your Bow

• Unload the bow: Remove all arrows and accessories from the string.
• Inspect for damage: Check limbs, cams, and cables for wear or cracks.
• Clear your workspace: Ensure you have ample lighting and a stable surface.

Safety First

Never attempt to disassemble or adjust cams under tension without a bow press if your model requires it. For bows with rotating modules, adjustments can often be made without a press, but always double-check the manual.

Measuring Your Ideal Draw Length

Determining your correct draw length is foundational to an accurate adjustment. There are several methods, but the most reliable is the “wingspan method. ”

The Wingspan Method

• Stand naturally with your arms extended sideways, forming a “T.”
• Measure the distance from fingertip to fingertip across your back.
• Divide by 2.5. This calculation gives a close estimate of your draw length.

Example: If your wingspan is 70 inches:

70 ÷ 2.5 = 28 Inches Draw Length

Alternative Methods

• Archery shop measurement: Many shops use a draw board and scale for precise fitting.
• Online calculators: Input your height and arm span for an estimate, but always verify in person.

Common Draw Length Ranges

Verifying Comfort And Fit

After measuring, simulate your draw with a bow or training aid. Your anchor point (usually the corner of your mouth or jaw) should feel natural, and your posture should remain upright without overextension.

Step-by-step Guide To Adjusting Obsession Bow Draw Length

Obsession bows typically use a modular cam system that allows for incremental adjustments, often in half-inch steps. The process may differ slightly depending on your bow’s model year and cam design.

Identifying Your Cam System

• Rotating module cams: Allow tool-free or Allen wrench adjustments; no bow press needed.
• Fixed module cams: Require module swaps or bow press for changes.

Adjusting Rotating Module Cams

• Locate the module: Usually found on the cam’s side, secured by 2-3 Allen screws.
• Refer to markings: Modules are often labeled with numbers or letters corresponding to draw lengths (e.g., “A” for 29”, “B” for 28.5”).
• Loosen screws: Using the correct Allen wrench, loosen (but don’t remove) the module screws.
• Rotate to desired position: Align the module’s mark with the desired setting.
• Tighten screws: Ensure all screws are firmly secured.

Pro Tip: Always adjust top and bottom cams to the same setting if your bow uses dual cams.

Adjusting Fixed Module Cams

• Use a bow press to relieve tension on cables.
• Remove old module and replace with the module for your target draw length.
• Reinstall and double-check all hardware for tightness.
• Carefully remove from bow press and inspect for proper function.

Draw Stop Peg Adjustment

Some Obsession bows include a draw stop peg that must be repositioned to match your new draw length. This peg ensures a firm, consistent back wall at full draw.

• Identify the peg on the cam or module.
• Move the peg to the corresponding position for your chosen draw length (refer to manual).
• Tighten securely.

Synchronizing Cam Timing

For dual-cam bows, cam synchronization is critical. After adjustment:

• Draw the bow slowly and check that both cams reach full draw stop simultaneously.
• If not, adjust cable lengths as needed (best done by a technician).

Example: Adjusting An Obsession Turmoil Rz

A hunter wants to shorten their draw length from 29” to 28”. They reference the module chart in their manual, rotate both top and bottom modules to “B,” move the draw stop pegs accordingly, and test the bow at full draw.

The process takes about 15 minutes and requires only an Allen wrench.

Testing And Fine-tuning After Adjustment

Once you’ve adjusted your draw length, thorough testing is essential. This ensures not only that the measurement is correct but also that your shooting form and arrow flight are optimal.

Dry-fit Check

• Draw the bow without an arrow.
• Settle into your anchor point and check for comfort and alignment.
• Verify that your bow arm is slightly bent and your release hand reaches your anchor naturally.

Paper Tuning

Paper tuning helps identify nock travel and arrow flight issues caused by draw length or other factors.

• Shoot an arrow through a suspended sheet of paper at close range.
• Analyze the tear: A clean “bullet hole” indicates proper flight; tears suggest further adjustment is needed.

Chronograph Testing

Measure your arrow’s speed before and after adjustment. Excessively short or long draw lengths can reduce velocity.

Example: After shortening their draw length by one inch, an archer notices a slight decrease in speed (from 310 to 302 fps) but a significant increase in shooting comfort and accuracy.

Field Testing

Take several shots at varying distances. Look for:

• Group consistency
• Natural anchor points
• Absence of overextension or cramping

Seek Feedback

If possible, have a coach or experienced archer observe your form. They may spot alignment issues or suggest minor tweaks for better results.

Common Challenges And Troubleshooting

Draw length adjustments can sometimes introduce new issues. Here are some common problems and their solutions.

Creep Or Cam Lean

If you notice cam lean or “creep” at full draw:

• Check that modules are set identically on both cams.
• Inspect cables for even wear.
• If issues persist, visit a pro shop for a full tune-up.

Peep Sight Alignment

A change in draw length may require repositioning your peep sight so it aligns with your eye at full draw. Adjust the peep’s position on the string and retie as needed.

D-loop And Release Aid Fit

With a new draw length, your D-loop may need to be resized or moved for proper release anchor. Ensure your release aid allows for a repeatable, comfortable anchor point.

Arrow Rest And Nocking Point

Significant draw length changes may alter your arrow’s position at full draw. Re-check your rest and nocking point for center shot and level.

String And Cable Life

Frequent adjustments can wear strings and cables prematurely. Inspect them regularly and replace as recommended by Obsession or after 2-3 years of heavy use.

Real-world Examples And Case Studies

Examining how other archers have adjusted their Obsession bows provides valuable insights.

Case Study 1: Competitive Target Shooter

A competitive archer with an Obsession Fixation 6M noticed inconsistent groupings during tournaments. After measuring, they realized their draw length was a half-inch too long. By rotating the modules and shortening the draw length, their scores improved, and shoulder fatigue diminished.

They also had to reposition their peep sight and D-loop, but the overall result was increased consistency.

Case Study 2: Bowhunter In Field Conditions

A bowhunter using an Obsession Turmoil adjusted from a 29” to a 28. 5” draw length after switching to heavier hunting clothing. This minor tweak ensured their anchor point remained consistent even with layers, preventing string interference with their sleeve.

Post-adjustment, they reported tighter arrow groups and more confident shots in the field.

Case Study 3: Youth Archer Upgrading Equipment

A young archer outgrew their first bow and transitioned to an Obsession Sniper LT. With help from a coach, they used the wingspan method to determine a 26” draw length, then adjusted the rotating modules accordingly. The new setting allowed for a comfortable, repeatable anchor point, leading to rapid improvement in competition scores.

Comparison: Obsession Bow Draw Length Adjustment Vs. Other Brands

How does adjusting an Obsession bow compare to other popular compound bow brands? The table below summarizes the key differences.

Pro Tip: Obsession’s rotating module system provides flexibility, often letting you adjust without buying new modules, which reduces cost and downtime.

Advanced Tips For Optimizing Draw Length

Once you’ve mastered the basics, a few advanced techniques can further refine your setup.

Micro-adjustments

Some Obsession bows allow micro-adjustments in ¼” increments using specialized modules or limb positioners. These can help you fine-tune for specific shooting styles or anatomical needs.

Matching Draw Length To Arrow Spine

A slight change in draw length affects your arrow spine (stiffness). After adjustment, test your arrows for optimal flight and consider re-tuning your setup if needed.

Experimenting With Different Anchor Points

A small shift in draw length can allow for more comfortable or stable anchor points, such as index finger to the corner of your mouth or jawbone. Experiment to find what delivers the best repeatability.

Seasonal Adjustments

Hunters often adjust draw length slightly for cold-weather gear. If you switch between light and heavy clothing, consider fine-tuning your draw length accordingly.

Keeping Records

Maintain a log of your draw length settings, arrow specs, and test results. This helps track what works and simplifies future adjustments.

Example: In my experience, keeping detailed notes on every adjustment has helped me quickly revert to previous settings if a new change doesn’t yield the desired results.

Frequently Asked Questions

What Happens If My Draw Length Is Too Long Or Too Short?

A draw length that’s too long causes overextension, leading to poor posture, less control, and increased string slap on the arm. Too short, and you’ll struggle to anchor consistently, often resulting in “chicken wing” elbow and decreased accuracy. Both scenarios can also lead to muscle fatigue and potential injury.

How Do I Know If My Obsession Bow Needs A Bow Press For Draw Length Adjustment?

Consult your owner’s manual or the Obsession Bows Official Site. Generally, bows with rotating modules do not require a press, while those needing module swaps or cable changes often do. If you’re unsure, err on the side of caution and use a press or consult a technician.

Can I Adjust The Draw Length Myself, Or Should I Visit A Pro Shop?

Many Obsession bows are designed for user adjustments with basic tools. However, if you’re uncomfortable working with cams or suspect synchronization issues, visiting a pro shop ensures safety and optimal performance. Certified technicians can also check for timing, alignment, and other tuning factors.

Does Changing Draw Length Affect My Sight And Peep Alignment?

Yes. Any change in draw length alters your anchor point, which can shift your sight picture and peep sight alignment. After adjustment, recheck and reposition your sights and peep for proper alignment at full draw.

Will Adjusting Draw Length Impact My Arrow Speed And Trajectory?

Slightly. Shortening draw length reduces power stroke, often resulting in a modest decrease in arrow speed. However, improved comfort and consistency usually outweigh any small loss in velocity. Always re-chronograph your setup and re-tune arrows after adjustments.

Fine-tuning your Obsession bow’s draw length is an investment in your archery success. By following these steps, using the right tools, and testing thoroughly, you’ll enjoy improved accuracy, comfort, and confidence with every shot. Remember, the journey to the perfect setup is as rewarding as the results on the target, embrace the process, consult resources when needed, and enjoy the precision and satisfaction that comes with a well-fitted bow.