Start from a known point.

Free, printable reference tools for choosing cartridges and bullets and working up loads, built on published manufacturer data instead of opinion.

In the works

• 01
  Cartridge Scorecard

  Factory-load cartridges ranked by game class, with the method and sources shown.

• 02
  Bullet Selector

  Narrow down which bullet to try first by diameter, weight, construction and use.

• 03
  Twist Rate Calculator

  Check bullet stability for your barrel at your elevation and temperature.

• 04
  Ballistics Calculator

  Trajectory, wind and energy, with printable dope cards.

The ground rules

• FreeNo paywalls, no ads.
• PrivateNo accounts. Your numbers stay in your browser.
• PrintableEvery tool prints a clean sheet for the bench or the field.

Get in touch

Corrections, data, or suggestions: hello@datumballistics.com