300 Spine Arrows: Heavy Shafts Buyer's Guide

A 300-spine arrow serves 70–80 lb compounds in the common case: 70 lb with a 30″ draw or a 125–150 gr point, 75 lb at 28–30″, and 80 lb at any draw length. Below 70 lb, 300 only makes sense when something else weakens dynamic spine — a 30″+ draw, a 150 gr+ broadhead, an aggressive hard cam, or a high-FOC build carrying 175+ grains up front. A 300 on a 60 lb bow with a 100 gr point is two grades too stiff: it will tear tail-left and group field points left of broadheads. The quick formula: 300 spine ≈ 70 lb baseline, minus allowances for heavy points and long draws.

Yes — with conditions. A 70 lb bow at 29″ with a 100 gr point is squarely a 340 bow; 300 becomes correct at 70 lb when any of these apply: draw length 30″ or more, point weight 125–150 gr, an aggressive single- or binary-cam bow (Bowtech, Mathews, Elite-class energy delivery), or a high-FOC build with 175+ grains ahead of the shaft. If your 70 lb setup is 29″ / 100 gr / moderate cam, buy 340 first — see the adjacent-grade decision on the spine comparison page. If you tick two or more of the 300 conditions, buy 300 and paper-tune one uncut shaft before committing a dozen.

Almost never — a 60 lb bow is 1–2 full grades weaker-spined than 300 for standard setups (60 lb at 29″ with 100 gr is a 400). The only realistic exceptions: a 60 lb bow with a 31″+ draw, a 150–200 gr broadhead, and an aggressive cam simultaneously — and even then a 340 is usually the safer choice. If you're considering 300 on 60 lb for penetration, you'll get more from a 400-spine heavy-GPI shaft (10+ GPI) pushing 500 grains total than from an over-spined 300 that planes and tears paper. Weight without spine match is just drag.

Shaft-only, a 300-spine carbon runs 8.9–12.0 GPI depending on the model — about 258–348 grains at a 29″ cut. Finished weights: a light micro-diameter 300 (Easton 5.0, Victory VAP) with a 100 gr head lands near 380–400 grains total; the standard hunting 300s (Axis, Gold Tip Hunter, 6.5) land 400–430; the heavyweight class (FMJ, PileDriver, Pierce) with a 125–150 gr head reaches 470–540 grains. That 380–540 band is exactly why 300 buyers are hunting elk, moose, and heavy bone — the arrow carries 15–30% more mass than the standard 340/400 deer arrow.

By use case: Easton FMJ 5mm 300 (≈11.7 GPI) is the benchmark for maximum mass and wind-bucking micro-diameter penetration; Easton Axis 5mm 300 is the do-everything heavy hunter with match-grade tolerances; Gold Tip Hunter 300 wins on durability and warranty in rocky country; Victory Rip TKO Sport 300 is the small-diameter favorite for high-FOC builds; Carbon Express PileDriver 300 is the value pick for raw kinetic energy; Easton 5.0 300 is the lightest credible 300 for shooters who want heavy-class stiffness without giving up all their speed. All six paper-tune predictably when the bow actually calls for a 300 — which is the 70–80 lb class, or 70 lb with heavy heads and long draws.

The micro-diameter speed-weight models: Easton 5.0 300 at about 8.9 GPI (≈ 370 grains finished with a 100 gr head on a 29″ shaft), Victory VAP 300 near 9.2 GPI, and Bloodsport's lighter Hunter runs around 9.5 GPI. Expect roughly 370–395 grains finished — about 20–30 grains lighter than a same-brand Axis or Hunter 300. The trade: thinner walls handle rock impacts and steel targets worse, so carry a spin-test habit (see the spine tester page) if you shoot hard angles. Lightest is not automatically best — at 300 spine you're buying stiffness first; the light models just let you keep 8–12 fps you'd otherwise donate to shaft mass.

Diameter, wall thickness, and weight class. The 5.0 is Easton's 0.204″ micro-diameter speed build (≈8.9 GPI); the 6.5 is the 0.246″ standard-diameter hunting line (≈9.5 GPI) with the widest component availability; the Axis is the 0.204″ micro hunting benchmark (≈9.8 GPI) with better straightness tolerance; the FMJ is a carbon core wrapped in an aluminum jacket (≈11.7 GPI) — the heaviest and the most wind-bucking, at the highest price and with the softest jacket. All four exist in 300 and all four spine-check honestly; the choice is mass budget versus budget budget. Micro diameters also concentrate insert weight forward — an FMJ 300 with a 100 gr insert lands near 19% FOC without any other changes.

Same spine class, three trims. The Hunter 300 (≈9.3 GPI) is the standard: .003″ factory straightness, the industry's famously forgiving warranty, and the widest parts stock. The Ted Nugent 300 is a Hunter-series shaft with a signature series cosmetic package and a slightly different stock length — mechanically the same taper class, often priced with promotions. The Pierce Platinum 300 (≈10.2 GPI) steps up to .001″ straightness and a heavier micro-diameter build for shooters who want tournament tolerances in a hunting shaft. For a first heavy dozen, buy the Hunter 300; upgrade to Pierce when you're sorting dozens on a spine tester and the extra straightness actually shows on paper.

The 250 class serves 80–90 lb compounds, 650+ grain moose and dangerous-game builds, outsert-equipped extreme-FOC arrows carrying 200–300 grains up front, and many crossbow bolt specifications. In carbon, 250-grade shafts run 11.5–13.0 GPI — a 29″ cut plus a 150 gr head lands 530–580 grains. The class behaves one grade stiffer than 300: on a 75 lb bow with a 100 gr head it's already too stiff, so it's genuinely a heavy-bow / heavy-build grade. If you're a 70 lb shooter eyeing 250 'for elk,' you're over-spined — the right elk move is a 300 with a 150 gr head and a 10+ GPI shaft, not a 250 you can't tune.

The 200 grade is the top of the consumer ladder: 90+ lb compounds, traditional-style heavy longbows in the 90–100+ lb historical class, specialty crossbow bolts, and elephant-conservation-cull professional builds. Production carbon at 200 runs 12.0–13.5 GPI, pushing a finished arrow past 650 grains. For the overwhelming majority of hunters it's the wrong purchase — a 200 on anything under 85 lb is three or more grades too stiff and cannot be paper-tuned into compliance with any practical point weight. If you shoot a sub-85 lb bow and want maximum arrow, the practical ceiling is the 250–300 class with outserts and 150–200 gr heads.

They lose 15–35 fps against a same-bow 340/400 light build — and the exchange is usually worth it. The physics: each 25 grains of added arrow mass costs about 7 fps, but momentum rises even as speed falls, because momentum scales linearly with mass while speed drops sub-linearly. A 470-grain 300 at 275 fps carries 0.71 lb·s of momentum and 79 ft-lbs of KE; a 380-grain 400 at 295 fps carries 0.65 lb·s and 85 ft-lbs. The heavy arrow trades 6 ft-lbs of energy for 0.06 lb·s of momentum — and momentum is what drives penetration through heavy bone. Run your own numbers on the dashboard above, and check the speed side with the arrow speed calculator on the homepage.