The best angle depends on bullet weight/ballistic coefficient and velocity also; lighter, faster bullets will go the furthest at shallower angles, while heavier, slower bullets will do better at somewhat higher angles. For .243, even low-BC hunting loads can travel 2 1/2 to 3 miles.
Max range calculator
.243 load data
Manufacturer: Nosler Description: Partition™ Spitzer
Caliber: 0.243 in Weight: 100.0 gr
Muzzle Velocity: 3000.0 ft/s
Temperature: 59.0 °F Pressure: 29.92 in Hg
Humidity: 0.0 % Altitude: 0.0 ft
Std. Atmosphere at Altitude: No Pressure is Corrected: Yes
Output Data
Atmospheric Density: 0.07647 lb/ft³ Speed of Sound: 1116.4 ft/s
Initial Angle:
35.0 deg Terminal Angle: 66.6 deg
Terminal Range: 4500.0 yd Terminal Velocity: 432.6 ft/s
Terminal Time: 31.0 s Terminal Energy: 41.5 ft•lbs
Manufacturer: Nosler Description: Partition™ Spitzer
Caliber: 0.243 in Weight: 85.0 gr
Muzzle Velocity: 3220.0 ft/s
Temperature: 59.0 °F Pressure: 29.92 in Hg
Humidity: 0.0 % Altitude: 0.0 ft
Std. Atmosphere at Altitude: No Pressure is Corrected: Yes
Output Data
Atmospheric Density: 0.07647 lb/ft³ Speed of Sound: 1116.4 ft/s
Initial Angle:
30.0 deg Terminal Angle: 63.4 deg
Terminal Range: 3993.3 yd Terminal Velocity: 387.1 ft/s
Terminal Time: 26.7 s Terminal Energy: 28.3 ft•lbs