CaliberAtlas is an independent educational ballistics reference with exactly 164 public cartridge records, representative-load data, calculated trajectory and energy tables where available, side-by-side comparisons, a ballistic calculator, and a printable range-card builder with DOPE truing.
CaliberAtlas is built and run by Preston Willis, founder of Willis Innovations LLC. It is an independent project — not owned by, sponsored by, or affiliated with any ammunition or firearms manufacturer.
CaliberAtlas uses manufacturer publications, SAAMI and C.I.P. standards where applicable, and standard G1/G7 drag references. Source coverage varies by record. The trajectory engine has a separate public comparison against manufacturer tables on the accuracy page, and its calculation assumptions are documented on the methodology page. Suspected record errors are reviewed against the supporting evidence before published data changes.