Reference
Free reference tools, no account
Everything here is open to anyone and stays that way. Nothing to install, nothing to sign up for, and no figure published without a source behind it.
Cartridges
Specifications, dimensions and factory loads, from the common to the obsolete.
Ballistics
Trajectory and energy, modelled from published data rather than guessed at.
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Ballistic comparison
Put cartridges side by side: velocity, energy and drop at range.
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Cartridge comparison
Specifications head to head, without the trajectory maths.
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Hunting guide
What is legal and what is adequate, by game and by state.
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Field guide
Identification and quick reference, built for a phone in a pocket.
Reloading
Powder and component references for people who load their own.
Firearms
Models, makers and the serial numbers that date them.