Rl23, 4831SC or N560 will be the ticket in that max. Rl26 will give good speeds too. The 300max is almost same capacity as the 300wsm. N555 is between N550 and N160 so it may be on the fast side.I did a seating test in the 6.5ss. It prefers 30thou off. That’s what I’m going to to in the 300max tomorrow. Picked the rifle up today. Will be shooting the Elite 205 Bullets in it. Got some VV N555 from another member today.