Build at the range. Trust in the field.

⌖Scope Savvy

BDC Scope Reticle Calculator

Choose your hunting scope and load. Its documented reticle marks fill in for you, then calculate a personalized range reference.

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Range-test before field use

The manufacturer’s chart is the correct starting reference for the exact scope and the load, zero and magnification it specifies. Your rifle’s barrel, actual muzzle velocity, ammunition lot, sight height and conditions can shift impact from that reference. Confirm your zero and each hold with your rifle and exact ammunition at a safe range before relying on it while hunting. Do not use an unconfirmed hold in the field.

Rifle, load & reticle

Hunting BDC

YOUR AMMUNITION

Enter your actual bullet details first. A scope selection loads its reticle data and reference notes; it does not lock you to the factory example load.

Choose a hunting cartridge Same cartridge list as Ethical Ammo Finder

Bullet weight gr

Muzzle velocity fps

Ballistic coefficient

Choose the model matching the bullet maker’s BC. G1 and G7 values are different scales.

Choose your cartridge, then enter the exact bullet’s weight, muzzle velocity and BC. Those values vary among loads for the same cartridge; the cartridge choice alone does not fill in bullet data. A selected scope’s factory example is shown separately as a reference and never replaces your ammunition.

Can’t find your exact scope?Use the photo intake below for the scope model, reticle, manual subtension chart and ammunition details. This preview stores and previews photos locally; it does not read them or add a scope automatically. Attach the same photos in this chat and I can extract the data, check the source and add a reviewed preset.Add a scope from photos ↓

CHOOSE YOUR SCOPE

Manufacturer and exact hunting modelChoose a documented reticle

Manufacturer reticle marks and printed yard references are fixed chart data; changing your BC does not change them. Your calculated range results appear below the reticle after you press Calculate.

ZERO, SCOPE POWER & CONDITIONS

Zero distance yd

Enter the distance, in yards, at which this firearm is sighted in.

Sight height in

Magnification in use

Focal plane

Temperature °F

Default baseline: 59°F. Adjust to your range conditions.

Altitude above sea level ft

Default baseline: sea level (0 ft). Adjust to your range elevation.

Table to yd

RETICLE DATA

Hold marks are loaded from the selected scope's documented reticle. Use Custom Reticle only if yours is not listed.

Loaded hold marksMOA at reference power

Custom reticle (optional)

Major reticle marks Primary hold points

Minor reticle marks Intermediate dots / hashes

Enter each mark as label:MOA, separated by commas. Only use measured or documented values at the reference magnification.

Reference magnification

SCOPE MARKS & HOLD TABLE

Choose a scope, review its source values, then calculate for your load.

Choose a scopeThe reticle drawing will appear only when its scope-specific geometry is available.

No ballistic calculation yet. Select a scope and press “Calculate my holds.”

—First hold range

—Last hold range

—Velocity at table end

Checked holds can be printed as draggable reticle labels or downloaded in a CSV table. Each label shows its reticle letter and calculated range in yards.

Add	Mark	Type	Hold	Manual ref.	Range result	Est. drop	Est. velocity	Est. time

TRAJECTORY CHECK

Range	Path	Required hold	Velocity

The simplified G1 preview excludes wind, spin drift and Coriolis. Scope marks stay tied to their documented model and reference power; loads and field conditions change the range where a mark intersects the trajectory.

PLACE & PRINT RETICLE HOLDS

Selected preset artwork appears here. If your exact scope is not listed, upload a reticle photo in the next section; it will load into this canvas.

Add checked holds together

Check the marks you want in the table above. Each becomes a draggable label with its letter and calculated yard range, such as A 100.

Add one custom label manually

Label to place

Reticle entry type

Your photos and placements stay in this browser preview; they are not uploaded to a server.

SCOPE NOT LISTED? ADD ITS SOURCE PHOTOS

Private to this browser

Enter the exact model and load details, then add the manual reticle/subtension pages and a photo of your reticle. These uploads are local previews only; to have the chart read and entered as a source-backed preset, attach the original photos in this chat. The reticle placement canvas is in the panel above. Uploads are local previews only; the canvas is manual placement, not automatic chart reading.

Scope manufacturer

Exact model / SKU / reticle

Cartridge and ammunition

Published load data

Manual / load chart photo

Photograph the manual page that shows the reference load and the reticle’s hold table.

Example of a spec sheet to photograph

Example BDC manual page with load data and a lettered hold table

This example uses a Crimson Trace .308 Winchester chart. Your uploaded page should match your exact scope and reticle.

No chart photo selected.

Photo of the actual reticle

Photograph a clear reticle view. Include the reticle and any lettered hold marks if the manual shows them.

Example Crimson Trace standard BDC reticle diagram with lettered hold marks — Example reticle diagram. Photograph your own scope’s reticle or use the matching manual diagram.

Example: reticle image with the lettered holds and subtension values visible.

After choosing a photo, the artwork panel above will show it for label placement.

No reticle photo selected.

PHOTO IMPORT & PRESET NOTES

Manual source record

Each scope preset should remain tied to its exact model, reticle, manual source, calibration load and reference power. If a chart image reveals a correction, record that with the preset before treating it as verified.