After a normal skydiver drop, the pilot spiraled down for a normal landing on a 2000 ft gravel runway with a powerline at the approach end. The wind was reported as variable at 5 kts. The pilot reported that during the landing, the aircraft touched down on the first 1/3 of the runway and the brakes were applied. Reportedly, the braking action was marginal and the aircraft ran off the end of the runway. The aircraft then struck a ditch and the nose gear failed. Prior to the accident, the pilot was warned that the aircraft brakes were marginal. The density altitude was about 2400 ft.
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