6 Best String Loop Materials For Heavy Draw Weights

A high-performance bow is only as reliable as the smallest connection point holding the entire system together. When drawing back heavy poundage, the D-loop undergoes extreme mechanical stress that can lead to elongation or catastrophic failure if the material is substandard. Choosing the right cord ensures that the energy transfer remains consistent and that every release is as crisp as the first.

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BCY #24 D-Loop Material: The Industry Standard

BCY #24 is widely regarded as the benchmark for professional target archers and serious hunters alike. Its consistent diameter and braided construction allow for a uniform knot that settles quickly and resists movement under high tension. Because it has been the market leader for decades, most bow technicians will know exactly how it behaves during the installation process.

For those pulling heavy draw weights, this material offers a predictable, modest amount of break-in stretch that stabilizes after the first dozen shots. It maintains its shape exceptionally well, which is vital for maintaining a precise peep sight alignment throughout a long day of shooting. It is the safest choice for archers who prefer proven reliability over experimental synthetics.

If the goal is a “set it and forget it” solution for a standard hunting setup, BCY #24 is the gold standard. While it may not have the exotic heat-resistant coatings of newer niche brands, its ability to hold a knot firmly makes it an essential component for any high-draw-weight bow. Choose this if dependability and ease of replacement are the highest priorities.

Pine Ridge Archery Nitro Loop: Ultimate Grip

The Nitro Loop is engineered specifically to address the problem of loop rotation and knot slippage. Its unique, slightly tacky outer texture provides superior grip against the serving, which helps prevent the loop from migrating during the rigors of a spot-and-stalk hunt. This material is particularly effective for heavy bows where the sheer force of the draw cycle tends to pull lower-quality knots loose.

The material is stiffer than standard BCY, which translates to a loop that holds its shape wide open for easier hook-up with a release aid. This stiffness can be a massive advantage in cold weather when fingers are gloved and dexterity is diminished. It essentially stays “ready” regardless of the ambient temperature or the humidity of the field.

Because the Nitro Loop is intentionally firm, it requires a very aggressive “burn” on the ends to create a solid anchor button. If the burn is not done correctly, the material can be prone to fraying. Use this material if the primary frustration is a loop that constantly twists or slips, as the added grip will solve that issue immediately.

Bohning Premium D-Loop Cord: Stiff and Secure

Bohning’s Premium D-Loop cord is renowned for its extreme rigidity, making it a favorite for archers who demand a consistent release every time. This stiffness keeps the loop standing upright, reducing the need to look down at the string when clipping in during a high-pressure moment. It provides a very tactile, secure feeling that many archers find confidence-inspiring.

The trade-off for this rigidity is that the material is less forgiving during the initial tying process. It resists bending, so ensure the knots are pulled tight with specialized pliers to prevent any unwanted gaps between the loop and the string. Once seated, however, the cord is virtually immovable.

This product is an excellent choice for competition archers or those using heavy-duty release aids that put significant pressure on the loop. If the bow setup requires a very specific loop length to maintain proper geometry at full draw, the lack of stretch in this material will keep that geometry locked in. It is best suited for those who are meticulous about their gear tuning.

Vapor Trail Archery D-Loop Cord: Zero Stretch

Vapor Trail has built a reputation on high-end string components, and their D-Loop cord reflects a philosophy of absolute minimal movement. For a bow set at 70 or 80 pounds, any stretch in the loop effectively changes the draw length and the timing of the cams over time. This material is designed to combat that shift entirely.

This cord is dense, tightly woven, and exceptionally smooth. It moves effortlessly against release hooks, which can actually improve the smoothness of the shot execution by reducing friction. Because of the density of the fibers, it handles the heat from a lighter extremely well, allowing for a clean, mushroomed end that won’t pull through the knot.

Select this material if precision is the primary objective of the archery program. It is ideal for long-distance shooters who cannot afford even a fraction of an inch of variability in their draw cycle. It is a premium product for those who take the fine-tuning of their bow’s performance seriously.

Gibbs Super Loop Material: Best for Heavy Bows

Gibbs has gained a cult following among traditional and compound shooters who push their equipment to the absolute limits of power. This material is specifically formulated to withstand the heat and friction generated by heavy, high-speed bows. It is thicker and more robust than most standard loop materials, providing a sense of confidence when pulling high-poundage rigs.

The sheer strength of this cord is its defining characteristic. It does not fray easily, and even after thousands of shots at heavy draw weights, it shows remarkably little sign of degradation. For an archer heading into the backcountry for a multi-week hunt, this durability provides peace of mind.

While the diameter is larger, it fits most modern releases perfectly. The only downside is that it can be slightly bulkier to tie, requiring a bit more patience to get the knots perfectly flush. For those shooting heavy arrows and heavy bows, the durability trade-off for bulk is a sacrifice worth making.

FirstString Premium Loop Cord: Maximum Lifespan

FirstString is widely known for manufacturing high-quality bowstrings, and their loop material follows that same high standard of craftsmanship. This cord is designed with a specific focus on chemical and environmental resistance. It stands up well against the sweat, bug spray, and oils that typically break down synthetic fibers during a long season in the field.

The balance between stiffness and flexibility is well-calibrated here. It is pliable enough to tie easily but firm enough to resist the dreaded “collapse” that happens when a loop gets wet. It is a highly balanced, all-around performer that rarely disappoints regardless of the bow’s draw weight.

This is the “reliable workhorse” choice. It might not be the stiffest or the thinnest on the market, but its ability to retain its integrity under environmental stress makes it a favorite for gear that stays in the woods for extended periods. It is highly recommended for anyone who prioritizes longevity and consistent performance over all else.

How to Choose the Right Diameter for Your Setup

The diameter of the loop cord should be dictated by the groove on the release aid and the thickness of the serving on the bowstring. A loop that is too thick may not fit securely in the release hook, leading to a “click” or a jump during the shot. Conversely, a loop that is too thin may bite into the string serving, causing premature wear on the bow’s center serving.

For most modern compound bows, a standard diameter of approximately 2.0mm to 2.2mm covers almost all use cases. Always check the manufacturer’s recommendation for the specific release aid being used, as some target releases have tighter tolerances than hunting releases. If the loop is difficult to pull through the serving or feels “jammed,” it is time to size down.

When in doubt, stick to the manufacturer’s suggested cord diameter for the specific bowstring construction. Using a significantly oversized cord on a light serving can actually push the center serving apart. Aim for a snug, secure fit that allows the loop to rotate freely around the string without binding.

Tying a Slip-Proof D-Loop for Heavy Draw Weights

The secret to a bombproof D-loop lies in the tensioning process rather than the complexity of the knot itself. Always use dedicated D-loop pliers to pull the knots tight after the initial hand-tying process. Pulling them tight with only the release aid is insufficient for high-draw-weight bows and will result in the knots migrating under load.

When burning the ends to create the “mushroom” head, ensure the flame does not scorch the structural fibers. A light touch with a flame creates a clean, rounded button that seats perfectly against the knot. If the material turns black or begins to bubble, the integrity of that end-stop has been compromised and should be trimmed and re-burned.

Finally, keep the loop as short as possible while still allowing the release to hook up comfortably. A longer loop increases the likelihood of “torquing” the string during the draw, which impacts accuracy significantly at higher poundages. A tight, compact loop is the most stable loop.

Recognizing When It Is Time to Replace Your Loop

A D-loop is a consumable part that will inevitably fail if left on too long. Look for “fuzzing” or individual strands breaking along the inner radius where the release hook makes contact. If the material begins to turn white or looks frayed at the knot base, it is already compromised and poses a safety risk.

Beyond visual inspection, pay attention to the “feel” of the loop. If the bow suddenly starts shooting low or the peep sight is not returning to its exact resting position, the loop may have stretched unevenly. A shifting loop is a clear sign that the material is reaching the end of its functional life.

Do not wait for a clean break to replace the cord. A broken loop during the draw can cause a dry fire or lead to injury. Keep a pre-tied loop or a spare length of material in the archery pack at all times, especially on extended trips where professional service is unavailable.

Preventing String Pinch When Using Heavy Arrows

String pinch occurs when the D-loop is too short for the angle of the bowstring at full draw, causing the loop to compress against the fingers or the arrow nock. This is common on shorter axle-to-axle bows or for archers with a longer draw length. Pinching can lead to inconsistent arrow flight and, in severe cases, cause the arrow to “pop” off the rest.

To mitigate this, increase the length of the D-loop slightly to allow the string angle to remain open. Another effective solution is to install “nock sets” or serving knots inside the D-loop to ensure the arrow remains centered and supported without being squeezed. This keeps the arrow nock square and prevents it from being lifted off the rest by the loop.

Always test for pinch by drawing the bow in a safe direction and checking if the arrow nock moves vertically as the loop tightens. If the nock is being lifted or pinched, adjust the loop length or move the nock points to create more clearance. A clear, pinch-free draw is essential for achieving the tightest groups with heavy, high-energy arrows.

Selecting the right D-loop material is a minor adjustment that yields massive dividends in bow consistency and long-term reliability. By matching the cord’s characteristics to the specific needs of a heavy-draw-weight setup, archers can eliminate the variables that lead to missed shots and gear frustration. Maintain the equipment diligently, stay attentive to signs of wear, and focus on the mechanics of the shot rather than the state of the gear.