Read the wind. Take the shot.

Range Twin puts you behind a rifle at distance with a wind you cannot see. Read the flags and the mirage, decide your hold, and find out what it actually cost you. Free, in your browser, no download.

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Practice

Train on your own, unranked. Same range, same physics and same wind model as a competition, with nothing riding on it. Needs a free Primox account, and you can start three practice sessions a day.

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Competitions

Ranked wind-reading challenges against a hidden condition. Everyone shoots the same wind, so the leaderboard measures the read and nothing else. Needs a free Primox account.

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Free tools

Ballistics utilities that run entirely in your browser. No account, and nothing you enter is uploaded - they just remember your settings on this device.

Ballistic Calculator

Trajectory solutions with G1 and G7 drag models, atmospheric compensation, wind, and spin drift.

Open the calculator

Target Generator

Printable competition targets at true 1:1 scale (print at Actual Size). Standard SR, MR, LR, F-Class and IBS Benchrest faces, with tiling.

Open the generator

Hit Simulator

Monte Carlo hit probability against circular or rectangular targets, with group size, CEP, mean radius and dispersion.

Open the simulator

Match Simulator

Monte Carlo match simulation on competition faces. Estimate the score a load should return once accuracy, wind and velocity spread are modelled.