What is the maximum range of a 20mm round?

The maximum range of a 20mm round can vary depending on the specific type of ammunition and firearm used, but generally, it can exceed 7,000 meters (about 4.3 miles) in optimal conditions. However, effective range for practical targeting is typically much shorter, often around 1,500 meters (approximately 1 mile) for accurate engagements. Factors such as projectile design, barrel length, and environmental conditions also influence the effective range.