Independent trajectory workspace

Ballistic Calculator for Scope Turret Labels

Calculate a G1, G7, GA or RA4 point-mass trajectory, compare level no-wind label data with current wind and incline conditions, then choose exactly which rows enter a new label draft.

G1, G7, GA and RA4 drag dataCurrent atmosphereExplicit label transfer

Trajectory inputs

Rifle, ammunition and conditions

Change individual units

01Ammunition

Drag modelUse the model printed with the bullet BC

Ballistic coefficient (BC)BC must match the selected drag model

Which drag model should I use?View ammunition shapes and typical uses

Match the model to the published BC. Shape is a visual guide only—the same projectile can have different BC values for different drag models.

G1 flat-base reference projectile sketch

G1

General rifle bullets

Common for traditional hunting, varmint and general-purpose rifle bullets when the BC is published as G1.

Reference shape: shorter rounded ogive with a flat base.

G7 pointed boat-tail reference projectile sketch

G7

Long-range boat-tail bullets

Common for modern match and very-low-drag rifle bullets when the BC is published as G7.

Reference shape: long pointed ogive with a tapered boat-tail base.

GA

Diabolo airgun pellets

For air rifles and air pistols using Diabolo pellets when the BC or data source specifies GA.

Shape: rounded head, narrow waist and flared hollow skirt.Strelok APK: Chairgun GA retardation table for Diabolo Airgun Pellet.

RA4

.22 LR rimfire bullets

For .22 LR ammunition when the BC or data source specifies RA4.

Typical shape: rounded nose, short body and a small heeled base.Strelok APK: For 22LR bullets.

Reference note: GA and RA4 descriptions follow the attached Strelok APK; G1 and G7 sketches show their standard reference projectile profiles.

Muzzle velocity m/sUse chronograph data when availableBullet weight grUsed for energy; the optional BC estimator also combines it with projectile dimensions

02Rifle and zero

Sight height over bore mmMeasure bore center to scope centerZero distance mThis row is always retained as zero clicks

Scope adjustment unitMIL and MRAD both use 0.001 radian

One click equals MOAChoose a common click value or Custom

03Atmosphere

Current local weatherLoads atmosphere and forecast wind. Wind direction is converted using the shooting azimuth below.

Temperature °CRelative humidity %

Station pressure hPaEnter absolute pressure at the shooting location—not sea-level-corrected pressure

Calculated density altitude: 33 m

04Current shot conditions

Wind drift starts enabled at 0 speed and 90° direction. Spin drift and Coriolis remain disabled by default.

Shooting / target azimuth °0° north · 90° east · 180° south · 270° west
Set this before loading internet wind; it is also used for Coriolis.Shooting inclination °Positive is uphill; negative is downhill

Wind driftMoving air; uses wind speed and direction.Enabled

Wind speed m/sWind direction from °0° headwind · 90° from right · 180° tailwind · 270° from left
Internet wind is a 10-minute model average at 10 m. Verify wind along the full shot.

Spin driftProjectile rotation; uses the Strelok twist and stability calculation.Disabled

Coriolis effectEarth rotation; uses latitude, firing azimuth, range and flight time.Disabled

Enabled effects and inclination change current-shot results only. Reusable label clicks always come from the level, no-wind reference solution.

05Calculation range

Start mMaximum mInterval m

The exact zero distance is inserted automatically when it is not already on the interval.

For inclined shots, enter line-of-sight (slant) distance rather than horizontal map distance.

The model holds the entered atmosphere constant along the trajectory. Treat very long or steep-shot results as estimates and verify them with an advanced solver and live fire.