Within Range

Within Range / Calculator

Know your setup. Understand your range.

Explore how your shooting and conditions affect modelled placement confidence inside a species vital-zone proxy.

Tussock country and Mount Ruapehu beneath broken cloud on New Zealand’s Central Plateau.
“Central Plateau”© Geoff McKay ·CC BY 2.0 · resized/compressed

Not legal advice or a guarantee. Always use your own judgement and close the distance when conditions are uncertain.

Start a calculationRecord practice
Your setup

Choose a factory load, or use ballistic data you already know for your rifle.

Manage saved profilesRequest a factory hunting load

Add a distance to see transparent ways the modelled result could change.

Choose a load and species.

Your shooting

Use a real group you shot recently, not a manufacturer accuracy claim.

Use a recent group shot from the position you would use (set under Refine; prone by default). Measure the widest two holes, centre to centre; a 6 cm group at 200 m is 3 cm @ 100 m. Accepts 0.7–87.3 cm @ 100 m.

Group not entered · 5 shots · Prone

Today’s conditions

Enter the wind you expect, including a deliberate 0 for a no-wind scenario. Blank uncertainty uses half of entered wind speed; at 0 wind that also assumes no wind-call error.

Optional. Fills altitude and temperature and shows forecast wind as a regional reference. Enter field wind and uncertainty yourself. Your browser asks first, then an approximate location is sent for weather data from MET Norway; exact coordinates are not saved.

Wind not entered · uncertainty defaults to half of entered wind speed

Enter wind speed, then review the model assumptions.

Refine the assumptionsProne · 90% target · 500 m altitude · 10°C

These have sensible defaults. Check them against how and where you will actually shoot.

Manufacturer velocity is measured from their test barrel, not yours. Enter your rifle's barrel length for an adjusted velocity estimate.

Your ballistic data

Add a custom ballistic profile

For handloads, chronographed factory ammunition, or any setup where you know the projectile, BC and muzzle velocity. The saved profile is also available in My Practice and DOPE.

Projectile useHuntingThe hunting calculator only accepts projectiles declared for hunting use.
Use the BC and drag model published for this exact projectile.
Your muzzle velocity

Use a measured value when you have one. This value drives the trajectory directly.

Manufacturer figures are a starting point, not a measurement from your rifle.
Chronograph sample details (optional)
Record measured values only. Blank does not mean zero variation.
Recordkeeping only once muzzle velocity is entered. It does not change the trajectory calculation.
What’s new Updated

  • Compare documented factory loads
  • Understand recoil with disclosed inputs

  • Measure a group from a photo
  • Your photo stays on your device
Read all updates →

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