Hitec’s expansive line-up of servos include the HS-755HB and HS-755MG “giant scale” servos offered with either the revolutionary Karbonite™ gears or metal gears. Both are perfect for larger R/C applications and feature dual ball bearings with a water and dust resistant case. The powerful HS-755MG delivers a whopping 200 oz-in of torque and the HS-755HB delivers 183 oz-in of torque at 6 volts.
The answer to this question is partially dependent on what you are using to control the servo. 
Click for a quick video explanation.
With an Average Radio System:
99°
Your average transmitter and receiver will output a relatively narrow PWM signal range.
Radio System + Travel Tuner:
200°
Adding a Servo Travel Tuner to your radio system setup will allow you to achieve wide PWM signal ranges.
Wide Signal Controllers:
200°
Controllers such as the Servo Commander, Arduinos, and Raspberry Pi servo hats can usually send a wide signal.
| Output Shaft Style | C24T Spline | 
|---|---|
| Voltage Range | 4.8V - 6.0V | 
| No-Load Speed (4.8V) | 0.28sec/60° | 
| No-Load Speed (6.0V) | 0.23sec/60° | 
| Stall Torque (4.8V) | 167 oz-in (12 kg.cm) | 
| Stall Torque (6.0V) | 200 oz-in (14 kg.cm) | 
| Max PWM Signal Range | 570-2400μsec | 
| Travel per µs | .110°/μsec | 
| Max Rotation | 200° | 
| Pulse Amplitude | 3-5V | 
| Operating Temperature | -20°C to +60°C | 
| Current Drain - idle (4.8V) | 8mA | 
| Current Drain - idle (6.0V) | 8.7mA | 
| Current Drain - no-load (4.8V) | 230mA | 
| Current Drain - no-load (6V) | 285mA | 
| Continuous Rotation Modifiable | Yes | 
| Direction w/ Increasing PWM Signal | Clockwise | 
| Deadband Width | 8µs | 
| Motor Type | 3 Pole Ferrite | 
| Feedback Style | 5KΩ Potentiometer | 
| Output Shaft Support | 1 Bearing and 1 Oilite Bushing | 
| Gear Material | Metal | 
| Wire Length | 11.81" (300mm) | 
| Weight | 4.12 oz.. (117g) | 
| Wire Gauge | 22AWG | 
| Servo Size | Large |