Broadhead weight is one of the most overlooked tuning decisions in bowhunting. Hunters obsess over draw weight, arrow spine, and broadhead style, then grab whatever grain weight the shop has in stock. But 100, 125, and 150 grain heads behave differently in flight, hit with different force, and — critically — shift your point of impact enough to throw off a sight tape built for a different weight. Here's how to actually choose.
Why Broadhead Weight Matters More Than You Think
Broadhead grain weight is really just front-of-center (FOC) weight in a different wrapper. Adding weight at the point of the arrow shifts your FOC forward, which improves arrow stability and often forgiveness in flight — but it also slows the arrow down and drops your trajectory at distance. Removing weight does the opposite: faster, flatter, but less momentum and a lower FOC that can hurt broadhead flight and penetration on tough angles.
This isn't just theory — it's a real, measurable shift in your arrow's point of impact. Swap from a 100 to 150 grain head without re-tuning your sight, and you'll be aiming at a completely different trajectory than the one your pins or tape were built for.
100 Grain: The Speed Standard
100 grain is the default weight for most factory arrow setups and the majority of broadheads on the market. It's a good all-around choice for hunters shooting standard whitetail-class draw weights (50-65 lb) who prioritize flat trajectory and maximum speed. If you're already shooting a well-tuned 100 grain field tip setup, matching it with a 100 grain broadhead keeps your tune consistent with minimal adjustment.
125 Grain: The Balanced Middle Ground
125 grain heads add just enough front weight to noticeably improve FOC and broadhead flight stability without a major speed penalty — typically 3-6 fps slower than an equivalent 100 grain setup. Many experienced bowhunters consider this the sweet spot for hunting arrows: a meaningful bump in penetration and forgiveness for a small trajectory cost. It's a particularly good choice if you're chasing tougher game like elk or bear but don't want to rebuild your entire arrow setup around a heavy point.
150 Grain: Maximum Penetration, Maximum Drop
150 grain heads push FOC and penetrating power to their highest practical level for a hunting arrow, at the cost of a noticeably slower, more arcing trajectory — often 10-15 fps slower than a 100 grain equivalent. This weight is popular with traditional and low draw weight bowhunters who need every bit of extra momentum to compensate for lower kinetic energy, and with hunters targeting the largest game where a deep, reliable pass-through matters more than flat trajectory.
The sight tape problem: Every grain of broadhead weight you add or remove changes your arrow's speed and drop at every distance past 20 yards. A tape built for 100 grain heads will shoot progressively lower than expected at longer range with a 150 grain head. Always rebuild your tape to match your actual hunting arrow setup — broadhead and all — using our free sight tape generator.
Head-to-Head Comparison
| Weight | Speed Impact | FOC Impact | Best For |
|---|---|---|---|
| 100 grain | Fastest, flattest trajectory | Lowest FOC boost | Whitetail, standard draw weights, long-range shooters |
| 125 grain | Small speed loss (3-6 fps) | Noticeable FOC and stability gain | All-around hunting arrow, elk, mixed game |
| 150 grain | Largest speed loss (10-15 fps) | Maximum FOC and penetration | Low draw weight, traditional bows, largest game |
How to Decide
Start with your draw weight and the animal you're hunting. If you're shooting 60+ lb and chasing whitetail or similar-sized game at moderate range, 100-125 grain gives you plenty of penetration with a flatter trajectory. If you're shooting under 55 lb, hunting elk, moose, or bear, or shooting a traditional bow, 125-150 grain compensates for lower raw speed with better momentum and FOC.
Whatever you choose, run your final arrow — shaft, insert, and broadhead together — over a chronograph or through our speed and sight tape calculator so your yardage marks reflect reality, not factory spec sheet numbers.
The Bottom Line
100 grain: Best flat-shooting option for standard whitetail setups and longer range shots.
125 grain: The best all-around choice for most hunters — small speed cost, real penetration gain.
150 grain: Reserve for low draw weight setups or the biggest game, where momentum matters more than trajectory.
Broadhead weight is never a set-and-forget decision — it's part of your whole arrow system, right alongside spine and total arrow weight. Once you've settled on a grain weight, rebuild your sight tape to match at SightTapeGen so every pin or mark is actually accurate to your hunting arrow.