The aircraft touched down about 300 metres after the threshold of the 1200 metre long strip, which sloped uphill. When the pilot realised that the aircraft would not stop before the end of the strip, heavy braking was applied. The aircraft overran the strip and the nose gear strut collapsed in the rough terrain. The pilot subsequently advised that had he initiated braking earlier the aircraft would have stopped in the remaining lenght. He had believed that there was more strip length available than was actually the case and it was considered probable that he had been deceived by the slope of the strip.