The numbers
- Manufacturer
- Vortex
- Reticle
- AR-BDC4 MOA
- Focal plane
- first focal plane
- Units
- MOA
- Magnification
- —
In the first focal plane the subtensions hold true at every magnification, so a hold is a hold wherever the zoom ring sits.
Reticle library · Vortex
Vortex AR-BDC4 MOA
Drawn to scale from Vortex’s own specification sheet, and checked mark by mark by a person. This is the same geometry Harson Ballistics draws your holdover on.
Drawn from Vortex Optics’s published specification.
Scopes with this reticle
- Spitfire HD Gen II 3x
- Spitfire HD Gen II 5x
Other Vortex reticles
Subtensions
Fixed-power prism ('Subtensions measured in MOA'); focal plane is moot, recorded FFP so nothing rescales. The 3x and 5x sheets draw and dimension the same reticle. Published: illuminated 1 MOA dot inside an illuminated broken ring 18.85 across its centreline, 1.5 thick; BDC bars 2.8 / 2.1 / 1.7 / 1.4 wide at 2 / 5.2 / 9.4 / 14.6 below the dot (the sheet does not name the distances); four .75 short bars between them; line and bars .5; wind dots .75. Drawn, not published (the sheet is to scale): short bars at 3.5 / 7.2 / 11.8 / 17.6; the line runs from the 2 bar to the 17.6 bar - nothing between the dot and the first bar, no horizontal line; wind dots at 1.8 (5.2 row), 2.6 (9.4 row), 3.5 (14.6 row) each side; ring arcs 50-130, -36.8 to 20 and 160 to 216.8 degrees.
How this one was checked
Verified 8 Oct 2026 against specs/vortex/VTX_SPR-300_SPR-500_AR-BDC4_MOA_RD_I_RI_ST.pdf page 1 (VTX_SPR-500, the 5x sheet, has identical ink outlines). Scale 6.2995 pt/MOA fitted to the three wind-dot rows, centre (198.0, 221.1) = the red dot; all thirteen published callouts then land (listed in tools/build_vortex_spitfire.py). Bars converted exactly from the single outline's vertices; ring from its vertex radii and cut angles; dots from their bezier extents.
Use it on your own rifle
Harson Ballistics draws this reticle at your magnification with your holdover marked on it, from your rifle, load and conditions. Works with no signal and no account.
Subtensions are published by the manufacturer and reproduced here for reference. Confirm your own dope on a range before you rely on any of it. Harson.ai is not affiliated with Vortex.