I find Nosler's velocity thresholds conservative at both ends. I wouldn't push it too far on the low end but on the high end I have exceeded the recommended velocity by 2-300 fps and they worked fine. The 57 & 65mm are dandy cartridges. I have the horn on for a 6.5x65 AI in a single shot rifle. A lot of trouble to slightly best the 270 Win. but who cares?

"When you disarm the people, you commence to offend them and show that you distrust them either through cowardice or lack of confidence, and both of these opinions generate hatred." Niccolo Machiavelli