We did slide forward. Maybe it looked backward from the right seat (Just out of curiosity, what kind of plane feathers into reverse? I've had the plane move forward when we feathered on a slippery ramp, never backwards.

and some one asked what the RFI was, it was 0.27 or 0.32 (one was for 7, the other for 32. Can't remember which was which but does it really matter?) when we landed. Sand and chemicals had been applied (from the ATIS).
We found the runway to be not that bad but then again we only weighed about 13,000 lbs that nite and barely touched the brakes.
From what I could see, she must have been traveling at a crawl when she slid off the end. Hell, could have been they were turning to get off on Bravo (the runway end, taxiways and ramps just needed coupla hacks and houses! HURRY HARD!). She came to rest 90 degrees to the runway facing the direction of Alert Road/7F hangar.
From my uneducated position, it was hardly an "over-run".
BBB