loading data published velocities

[stubblejumper]

I have found over the years that loading manual velocities should not be taken seriously,but a trip to the range today demonstrated just how much velocities can vary.My rifle is a factory 280AI.According to the Nosler web site, 59gr of IMR 4831 behind a Nosler 140gr Accubond in a Nosler case should produce around 3160fps-3170fps,however in my rifle,the identical components were only producing 2970fps.The maximum powder charge listed on the Nosler site is 60gr,and the velocity listed is 3222 fps,so there is no way that I will reach 3200fps by only adding one grain of powder.What I will do is work up to 60gr,and if there are still no signs of case web expansion,I will work up to 61gr in the hope of at least reaching 3100fps with good accuracy.