6.5-284
Brass, use Win, Norma or Lapua
Powder, H4831...51 to52gr. Start 10% lower and work up, watching for pressure signs.
Bullet, Sierra, 140 or 142gr match
OAL, about 0.010 into the lands.
Chamber, if you have a custom chamber with a tight neck then neck turning will be required.
Enjoy Bill