What arrow spine for 65 lb draw at a 29 inch arrow
The starting spine for a 65 lb draw at a 29 inch arrow with a 125 grain point, and the weight floor.
Dry-fire warning
Crossbow bolt data and archery arrow spine, nock and thread data are quoted from each manufacturer's published figures, owner documentation and industry standards, cited on every page. A nock, spine or grain-weight mismatch can cause a dry-fire that damages the bow and can injure the shooter. Confirm against your own owner's manual and the arrow maker's own chart before shooting, and never drop below the stated minimum total weight.
| Draw weight | 65 lb |
|---|---|
| Arrow length | 29 in (cut, nock groove to shaft end) |
| Point weight | 125 gr |
| Recommended spine | 300 (published band 300-340) |
| Minimum total weight | 325 gr, from the 5-grains-per-pound floor |
Easton 5mm Axis carbon arrow shaft (300 spine)
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The 65 lb 29 inch setup is a 340 with a 100 grain point, but a 125 grain point weakens the dynamic spine by one group, so it moves to a 300. This is the point-weight adjustment in action.
Spine is a starting point, not a guarantee, because a 340 from one brand can differ from another. Confirm on your arrow maker's chart at 29 inches and 65 pounds, or bare-shaft test before cutting a dozen.
Whatever spine you land on, keep the finished arrow at or above 325 grains total, the 5-grains-per-pound floor, so the bow is not shooting dangerously light.
The rules behind this pick
Sources: Nock On Archery - Arrow Spine Chart: choosing the correct spine · Easton - Hunting Arrow Size Selection chart and adjustment rules (PN 301055-A)