How to Increase Your Arrow’s Penetration with Weed-Whacker Line

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A large portion of the archery world has been obsessed with speed for quite a while now, and it has led to many bows that shoot well over 300 fps. In my experience, however, one huge factor in arrow penetration is arrow weight. Heavy arrows penetrate better that light arrows. The pendulum is starting to swing back, and I'm seeing a lot more folks opting for much heavier arrows, which are slightly slower. Sure, you have to adjust your sights or shooting, but the increased penetration is worth it for them.

There are several ways you can increase arrow weight. One way is by adding heavier points. But when you increase the weight on the front of a tuned set of arrows, it changes the dynamic spine, making your arrows flex more during the shot and altering their flight.

One of the easiest ways to add some thump to your setup—without changing the spine of your arrows—is to add internal weight. You can buy commercially made weight tubing that fits inside your arrow and adds significant weight without altering the flexibility of the arrow. But there’s an easier, cheaper way: You can use plastic weed whacker line to do the same thing.

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To prepare for his muskox hunt this week, my buddy Nick did this for his arrow setup. He was able to fit three strands of line inside the arrow shafts. They ran the full length of the shafts and increased his arrow weight from a solid 438 grains to a bone-crushing 563 grains: an increase of about 29 percent. This weight slowed the arrows a little bit, but they still fly like darts.

If you’re wondering how a heavier arrow will perform on game, give this cheap, easy method a try this season. Hopefully by the time you read this, there will already be a muskox on the ground that can testify to its effectiveness.