Arrow build for the Bowtech Specialist II 38 (2022) — spine, weight, speed
The numbers below are not a chart lookup — they're the output of The Forge's physics engine for a real hunting arrow on the Bowtech Specialist II 38 (2022) (325 fps IBO, 65% let-off) at 60 lb and 29" draw. Change anything — length, point, vanes — and every number recomputes live when you open it in the workshop.
The recommended starting build
- Spine: 340 (engine-picked for this draw weight and arrow length)
- Total arrow weight: 354 grains
- Estimated speed: ~293 fps
- Kinetic energy: 67 ft·lb
- Momentum: 0.46 slug·fps
- FOC: 14.6%
▸ Open this exact build in The Forge — free, loads with every component above already selected. Adjust it to your draw length and it re-grades itself for whitetail, elk, and moose as you type.
Common questions
What spine do I need for a Bowtech Specialist II 38 (2022) at a different draw weight?
Spine need moves with draw weight, arrow length, and point weight together. The Forge's spine gauge shows stiff → perfect → weak live as you change any of them — open the build above and slide your numbers in.
Is this arrow heavy enough for elk?
The workshop grades the finished arrow against whitetail, elk, and moose thresholds using kinetic energy and momentum — the verdict updates as you build. This starting build's 67 ft·lb is graded the moment you open it.
Where do these numbers come from?
Published manufacturer specs (325 fps IBO for this bow) run through the same physics The Forge uses for every build: IBO-corrected launch speed for your draw and arrow weight, Easton-method KE and momentum, and a spine model validated against manufacturer charts. When you chronograph your real bow, your measured speed replaces the estimate everywhere.
Built by archnerds, for archnerds — The Forge by Sparrow Expeditions. One workshop. One loop. Always getting sharper.