Hi all,
The P3 Orion, with similar engine/gearbox setup to the C-130, it's just the gearbox that's upside down on the Herc, CAN be selected into reverse in flight, although you can't do it unintentionally!
The prop low pitch stop can be overcome by selecting the ground range with the power levers (the P3 does not have the ground/flight selector like the Herc, it's done automatically, when ground range is selected.)
The catch is, that to select ground range is very difficult, physically, to overcome the power levers' solenoid controlled stops, which are in place when the aircraft is airborne, but it can be done!
Very dangerous to try though, with big props and a stubby wing, it would drop like a stone.
Also, the P3 does not have anti-skid brakes, pity.
Cheers