Effective range is one that is meaningful – when outside of this range the BB would start to accelerate downward from your line of aim. We assume there is a correlation between the FPS rating and the effective range given a reasonable airsoft configuration. This app will help you find out the effective range given a particular FPS rating.

Android: https://play.google.com/store/apps/details?id=com.airsoftpress.effectiverange

Windows & iphone: https://fingertainment.itch.io/finding-the-effective-range

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