Try a 3D Long Range Shooting Simulation.

Do you want to experience what Simo Hayha, Hathcock, Vasily Zaytsev, and other great snipers needed to overcome? You're in the right place to play the most realistic long range shooting simulator.

In this game you can configure the shooting parameters, the ammo, and the atmospheric conditions. The most relevant factors about external and internal ballistics are taken into account, so it's the best interactive simulator available.

The most important physics factors are modeled into this realistic sniper game: gravity, drag (G7 Ballistic Coefficient), spindrift, wind, temperature, pressure, and air density. It features realistic scope settings: Elevation, Zoom with appropriately scaled reticles, and Windage. There's also an in-game and easy-to-use ballistic calculator to make it possible to achieve one-shot/one-hits under wild weather conditions.

This game was contrasted with JBM Ballistics giving great results.