Long-range field sim  ·  DOPE book  ·  18+

Train the shot.
Trust the book.

Your rifle's data, dialed.

A scoped field simulator that runs a real ballistic solve on every press — and the logbook that keeps what your rifle taught you.

Play free — no account Save your book — free account

Runs in the browser · 18+ · Not a fire-control system.

Actual ZeroDope scope view: a mule deer buck on an uphill face at 230 yards, mil reticle at 15.9×, laser return tag over the animal.
Ranging — auto on the buck
Actual HUD ranging panel: AUTO mode locked at 230 yards on a mule deer, three wind-zone readouts.
Firing solution — hold 0.67 up · 0.23 right
Actual HUD solution panel: 0.67 mil up, 0.23 mil left drift, 8 mph wind at 3 o'clock, 0.27 s time of flight.
Glass the hill
RK4 point-mass solverG1 / G7 drag3-zone wind fieldSpin drift + Coriolis11 field scenes6 game modes9 optic profiles22-load factory library

The sim

Glass. Range.
Hold. Press.

Eleven scenes, from known-distance steel to timber, prairie, alpine basins, canyon rims and city rooftops. Pan the whole panorama, pick the target out of the terrain, and get honest about wind.

LRF + auto ranging
Lase it yourself, or let the unit track what's under the reticle — with the angle and the horizontal-equivalent range in the readout.
A wind field, not a number
Three zones between muzzle and target, each gusting on its own. The solver knows the truth; you get a call. The difference is the lesson.
Six ways to run it
FREE · LRF DRILL · MOVERS · STAGE · HUNT · JUDGMENT
Actual app: full rifle stage, glassing up a mountain face in HUNT mode, HUD panels on the corners of the stage.
Fig. 01 Mountain · glassing up the face · HUNT Actual app
Actual app: MOVERS mode on the prairie, a moving target with lead readout in the HUD.
Fig. 02 Prairie · MOVERS · lead in the HUD Actual app

Movers walk the treeline. The HUD reads your lead in mils, the solver charges you for time of flight, and the wind keeps gusting while you track.

Weather is part of the stage: rain, mirage, gusts, failing light. HUNT drops one animal somewhere on the hill and gives you one press.

Actual app: shot card decomposing a miss into wind, angle and wobble, with a pelt and anatomy overlay of the animal.
Fig. 03 Shot card · downhill HUNT · the miss, decomposed Actual app

The coach

It tells you why you missed.

Every press gets decomposed: the wind you didn't hold, the angle you ignored, the wobble you broke through — in inches on the plate and mils on the reticle.

On game, an anatomy overlay shows exactly what the bullet did. JUDGMENT mode grades the shot you didn't take, too — passing on a bad angle is a score, not a failure.

The book

Apps die. Your dope shouldn't.

Every shot you log builds the book: dial-ups that hit, wind calls that lied, cold-bore truth — per rifle, per load. ZeroDope trues muzzle velocity and BC from your real impacts, then hands you charts and a range card you can shoot from.

Actual app: DOPE page with trued trajectory and wind drift charts for a logged load.
Fig. 04 The book · trajectory + drift, trued from logged shots Actual app

TRAIN closes the loop. Drills built from your own logged DOPE — the app quizzes you on your rifle, keeps score, and finds the ranges where your book is thin.

Local-first: the book lives on your device. A free account persists it; Pro syncs it across devices. Export JSON any time.

Actual app: TRAIN page scoring drills against 26 logged shots.
Fig. 05 TRAIN · drills against your own book PRO

Access

What's free. What's not.

No bait: the sim is free to play with no account. The book needs a free account — that's what makes saving possible. Pro pays for the parts that cost real money to run.

What you getGuestFree accountPro
Price$0$0$3 / mo · $24 / yr
The sim — field scenes, weather, HUNT●●●
Play shared stage codes●●●
Save rifles & loads—5 + 5Unlimited
The book — DOPE & shot log—●●
MV & BC truing from your impacts—●●
Trajectory & drift charts, range card—●●
TRAIN — drills against your DOPE——●
City scenes · night vision · thermal——●
Create & share stage codes——●
Sync across devices——●
Phone-on-rifle mode——●

Swipe for free account · pro →

Guest cannot save gun data, DOPE, or shooting data. It is session-only — close the tab or clear storage and it is gone. Everything else about the sim is identical to a signed-in player.

Pricing

Priced like a box of ammo isn't.

No ads, no selling your load data — the price is the business model. Pro keeps the servers up and the updates coming, and you can cancel whenever.

Start as a guest, keep the free account forever. Go Pro when the book earns it.

Pro · monthly

$3/ MO

Cancel any time. Your book stays yours — export it as JSON.

Pro · yearly

$24/ YR

Four months free against monthly.

Go Pro Play free first

Share a stage

Send someone up the hill.

Every stage compresses to a code — terrain, mode, weather, light, position. Text it to a buddy and they play the same hill in the same wind.

ZD-UPHILL-HUNT-7-GUSTY-RAIN-DUSK-PRONE Play this hunt
Playing a code needs no account. Creating codes is Pro. One rifle · one press