I shoot a 7mm Allen mag, full power loads will run a 160 gr. nosler at almost 3700 fps
I assume you are running somethingclose to a30 barrell length. That has more to do with your "extreme" velocities than the Allen case. Comparing cartridges performance with a 4"-6" difference in barrel length willyield misleading results especially in 100+ grain cases.
What does a rifle like that weight?