Everyone's chamber is a little different, but you should be fine at that distance. I run the 75 ELD at 2.405 COAL with 8208XBR and that is around .020 off the lands from what I remember. Let us know the N540 load when you get it dialed in.
I'm running 24.9 N540 with the 80 ELD-M, CCI 450, LC...