The ranging gun was considered a success on the Centurion and was fitted to several marks of it, including retrofitting to earlier models with the 84 mm gun. The same ranging gun principle was later used for the 120mm gun of the Chieftain. It was considered less successful with the more powerful gun, as the range for accurate ranging was limited to 2,600 yards — beyond this the tracer element burned out and the fall of shot could no longer be seen. As the gun's own range with HESH could be up to 8,700 yards, this represented a serious limitation on performance. Battle planning at this time also saw a need for combat at increasing ranges, from the 2,000 yards expected for the Centurion's vintage out to 3,000 yards and beyond. As soon as they became available, the Chieftain rapidly adopted a laser rangefinder instead.