Killer Instinct Crossbow Bolts & Arrows (HYPR 20")

Killer Instinct's factory bolts are the HYPR series — typically 20-inch carbon crossbolts designed to match the FPS ratings on the bow's Lumix scope. Two things to know:

• HYPR — the standard-weight crossbolt built for a balance of speed and downrange energy.
• HYPR Lite — a lighter option that squeezes out extra FPS, useful when you want to hit the bow's advertised top speed.

Bolts ship with field points and a specific nock type (commonly a half-moon or flat nock depending on the platform). The nock has to match your string and rail — using the wrong nock is a common cause of poor string contact. Browse options on our bolts and arrows and accessories pages.

Nearly all current Killer Instinct crossbows shoot 20-inch bolts, so length is consistent across the lineup — from the Lethal 405 and Boss 405 up to the Logix 435 and Vital-X 430. What varies:

• Nock type — confirm your model uses the same nock (half-moon vs flat) as the replacement bolts. The wrong nock risks poor string engagement.
• Recommended total weight — the FPS ratings and scope calibration assume a specific bolt-plus-point weight. Faster bows like the Rapid 420 or Fuel 415 are rated with a particular arrow weight.

When in doubt, buy the HYPR bolt spec'd for your model, or verify length, weight, and nock against your owner's manual. Accessories differ by model — never assume.

Bolt weight is a tradeoff:

• Lighter bolts (HYPR Lite): more speed and a flatter trajectory, but less kinetic energy and more sensitivity to noise/vibration. Good for target work and open-country shots.
• Heavier bolts (standard HYPR or added insert/point weight): more downrange energy and penetration, quieter shot, better for larger game. Trajectory drops a bit faster.

Two rules that protect you: never shoot underweight bolts (it acts like a partial dry fire and can damage limbs), and keep total arrow weight consistent so your calibrated reticle stays accurate. Match broadhead weight to your field-point weight, then confirm zero before hunting.

Every current Killer Instinct crossbow in the 400 FPS and up range - the Lethal 405, Fuel 415, Rapid 420, Vital-X 430, and the Logix 435 flagship - is calibrated around the 20-inch HYPR crossbolt, so the fast rigs do not need a different arrow, they need the right weight in that arrow.

• Stay with standard HYPR, not HYPR Lite, on fast bows. The heavier standard crossbolt (roughly 430 total grain with a 100-grain point) keeps more downrange energy and quiets the shot; HYPR Lite trades that away for a few extra FPS you rarely need on a bow already rated 400+.
• Want maximum penetration? The heavier HYPR KE (around 450 grain) buys deeper penetration on larger game at the cost of a slightly faster trajectory drop.
• Never drop below the recommended weight. An underweight bolt on a 400+ FPS limb behaves like a partial dry fire and can crack a limb.

Whichever grain you settle on, keep total arrow weight identical across your quiver so the calibrated Lumix reticle stays true, and confirm zero before you hunt.

Carbon bolts fail suddenly when damaged, so inspect before every session:

• Flex each shaft and listen/feel for cracks or splinters. Discard any bolt that creaks or shows fractures.
• Check that nocks are seated fully and not cracked; a loose or split nock is a leading cause of misfires.
• Inspect vanes for tears and re-glue or replace as needed.
• Tighten field points/inserts — a spinning point walks your groups.
• Retire bolts that have taken a hard impact even if they look okay.
• Keep one field-tipped bolt as a decocking bolt if your bow has no reverse crank - see how to decock a Killer Instinct crossbow safely.

Consistent bolts pair with a good string and a tuned scope to hold tight groups. Keep spare nocks and field points in your parts kit.

Round out your setup with:

• Lumix scopes — calibrated to the FPS your chosen bolt weight produces.
• DSC Dead Silent Crank — consistent draw for repeatable bolt speed.
• Cases — protect fletched bolts and points in transport.

Not sure which bow shoots best with HYPR bolts? See our best Killer Instinct crossbow picks and full reviews.

Every current Killer Instinct model runs the same 20-inch HYPR pattern, so bolt choice is about grain weight and nock type rather than about finding a model-specific arrow. Where it does matter is fit and setup - each model page lists the published draw weight and what ships in the box:

• Lethal 405 - 210 lb, ships with three HYPR Lite bolts and a rail lube stick.
• Boss 405 - 220 lb and the heaviest draw in the 405 tier, with an adjustable stock.
• Fuel 415 - 210 lb with a 14.5 inch power stroke and an ambidextrous crank.
• Logix 435 - the 435 FPS flagship, 15 inch power stroke, crank sold separately.
• Tempr-X - the narrowest at 6.75 inches cocked and the lightest draw at 195 lb.
• Vital-X 430 - the fastest forward-draw model in the line at 430 FPS.

Running heavier bolts buys you penetration and quiets the bow down; running lighter buys you a flatter trajectory. For whitetail inside 40 yards the stock HYPR bolts are entirely adequate. You will also want a spare set of strings and cables and, eventually, replacement parts like a rest or rail lube - those wear out long before the bow does.

Bolt size is the same across the current lineup - 20-inch HYPR crossbolts - so the quick answer for any model below is a 20-inch bolt. What changes model to model is the published draw weight, which sets how much bolt weight the bow was tuned around:

The standard HYPR is roughly 430 total grain with a 100-grain point, the heavier HYPR KE runs about 450 grain for more penetration, and HYPR Lite is lighter for extra speed. When a listing shows a longer figure such as 34 1/2 in, that is a string length, not a bolt length - always match strings to the exact model and year.

Because bolt weight changes your true arrow speed, re-confirm your zero after switching bolts - see our guide to sighting in a Killer Instinct crossbow and matching the scope's SpeedRing to your setup.

If the bow will not fire at all, a poorly seated bolt is a frequent cause - our Killer Instinct crossbow troubleshooting guide covers dry-fire lockups and other common problems.

For a full breakdown of the HYPR variants - Lite, V, SS and the heavier KE - and which one your bow is calibrated for, see our Killer Instinct HYPR bolts guide.