start at 54 go to 58.5, might get pressure before that. Mine likes Low to mid 57s maxed out at 2984 fps with no pressure signs and an es of 7 and an SD of 2.8. 143 eldx
The 143 ELD-X was not all that sensitive to seating depth in my two 6.5x284's. The are both seated at .025" off the lands. Accuracy <.5MOA, ES <12 FPS.