I have a good friend and coyote hunting partner who ran a 20-250 for a season. His was a 9 twist and he shot the 55 grain Berger i don't remember off hand what his load was but i remember that it was very fast. His longest coyote kills on bedded coyotes were over a 1000 yards. On paper and in the field this thing was fantastic however it was almost to much of a good thing at times as the barrel was toasted rather quickly. The other factor was that was that when it was below 0 the 9 twist wasn't quite fast enough for extreme cold weather. Overall it was a wicked coyote rifle and the pelt damage was minimal but barrel life made it a no go after that first barrel was toasted.
