Ken Climo and his friends were at our local course (he lives, I guess, or did), and I watched them throw. The course, already really small, was not big enough for them, so they had to skip baskets and go for the next hole's basket to have any challenge.
When I watched them, I really thought, by the look of their run-ups that the discs were going to go about 350 feet. But they just kept going.
But their throws were not hard and did not look powerful at all - they were just smooth, and they were so easily throwing 450 - 500.
But, also, they are not physically powerful guys - not in the sense of having excessive strength: just refined strength and finesse.