In short, the Ballistic Calculator mod can lock your gun’s aiming point at a specific distance. This is especially useful when your reticle points at the sky, causing shell trajectory calculations to be based on a distant background point. The aim point and distance can be locked by pressing the Q key. And yes, this mod is officially allowed by the developers.
Looking at the screenshots
1. Locked reticle — the displayed distance matches the distance to the target.

2. When using the mod and pressing Q, you can see how the shell trajectory changes relative to the selected target.
3. With the reticle locked, the crosshair turns green even when the target is behind an obstacle. This is because the game understands that the shell is calculated to travel toward the enemy tank and displays its effective armor values and penetration chances.

Important to Understand
A shell will not automatically hit the target 100% of the time, since normal gun dispersion still applies. You must also account for shell velocity when leading moving targets. The mod can only assist in certain situations, and you’ll need practice to use it effectively.
Examples of Mod Usage
• If an enemy is moving and you need to lead your shot, but the sky is behind them and the reticle keeps calculating distance based on the background. You can lock the enemy’s distance and then fire with the proper lead.
• If an enemy is sitting on a ridge and disappears from view while the sky is behind them. You can lock the distance before they disappear and fire at the same location where they were last spotted.
• If an enemy is behind cover and you’re using a tank with a gun that has a highly arcing shell trajectory. You can lock onto a visible part of the target and then fire at a hidden section of the tank while remaining behind cover.
History of the Mod
The BalCalc mod first appeared during the early years after the game’s launch, but attracted little attention at the time. Various modders updated and improved it over the years. Eventually, it broke and remained unusable for a long time.
In June 2025, the well-known Polish modder Aslain updated it to work with the current version of the game. Then, on June 2, 2026, Turkish content creator Canovar brought significant attention to it.
Links
• Download the latest version of the mod: https://wgmods.net/7707/
• Visual demonstration of the mod by Canovar (in English):

This would’ve been huge like ~10 years ago with a KV-2…
Now that most of the trollguns were castrated… Not so much…