Reticle library · ZeroTech
Drawn to scale from ZeroTech’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 ZeroTech Optics’s published specification.
In the second focal plane the subtensions are only true at one magnification — check your manual for which, and dial there before you hold.
ZeroTech MILDOT spec sheet, 4-16x50 column. Published: A=B=G=H=1.0 mil (dot spacing and centre-to-first-dot), C=0.27 mil post thickness, D=0.05 mil fine line, E=14 mil TOTAL fine-line span (so +-7), F=0.12 mil dot diameter. SFP: true at maximum magnification. Six dots an arm.
Verified 14 Sep 2026 against ZeroTech's own MILDOT spec sheet (resources.zerotechoptics.com/images/reticleManuals/mildot-specs.pdf) by reading the PDF's vector shapes with pymupdf. The sheet is one generic drawing plus a lettered dimension table, with four values varying by scope. Scale came from the drawing itself: the mil dots sit on a 19.76 pt pitch, and A=B=1.0 mil is published, so 1 mil = 19.76 pt. Every dot then lands on a whole mil to within 0.01 mil on all four arms. THE CORRECTION THAT MATTERED: E is the TOTAL span of the fine crosshair, post tip to post tip - the sheet's E arrow runs the full width - and the record had been reading it as a half-width, so the usable scale was drawn twice as wide as it really is. Measured, the fine line spans 283.58 pt = 14.35 mil against a published E of 14, and the posts begin exactly where it ends. The record also had one dot per arm too few. The drawing is dimensioned for the 4-16x50 column: its fine line measures +-7.2 mil, it carries six dots an arm, its posts are 0.305 mil thick and run from 7.2 out to 11.0 mil where the field-of-view circle cuts them. The drawn 0.305 sits between the two published post thicknesses (0.27 and 0.36) and the drawn dot of 0.142 mil sits between the two published diameters (0.12 and 0.16), which is how you can tell the art is generic and the table is authoritative. Published values are therefore used for C, D and F rather than the drawn ones. The post's OUTER end is not a published dimension - it is where the sheet's field-of-view circle clips it - so it is carried across at the drawn proportion and is not a hold reference. This record is the 4-16x50 column, which is the one the sheet draws, so every feature here is measured rather than carried over: E=14 gives +-7 mil and six dots an arm.
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 ZeroTech.