I wouldn't let the bullet jump steer you. I shoot the .338 Hammer 285 HH .250" off with good results. ( 1 hole ragged edges @ 100 )I am seated all the way to the top of the first ring at .185" off the lands, Hammers are not supposed to be critical of seating depth but at 1.5MOA, I am going to seat them longer. My magazine length will let me seat out to .067" off the lands. Perhaps I should start there instead of the full depth where I did start.
This is with a full case of N570 = best accuracy for me.