You should be well above those velocities.7mm man. You are way up there in elevation. I'm at 31 feet lol. But I have a 1-8tw Krieger in my 6.5x300 and run those 153.5 BERGERS and they are fine atleast at 100 yards. Hard to find long ranges in NJ. But might be getting access to farther distances to stretch its legs. I got her going just under 3200 fps. Probably 3150 will be max with N570. I am onto US869 NOW. I am pushing forward to find pressure so will see where it's at. Right now I am 3165 with zero pressure noted. More loads developing today in this rain storm.
I have a 264 Win Mag Ackley Improved with a 28" proof barrel and can easily hit 3300fps with 156 EOL Bergers. I've hit 3400 but it was so close to the edge on pressure that one would extract easily and the next may have a stiff bolt and clicker.
I currently run it at an easy 3150 to save brass and barrel life.