I am fond of the the 245 grain leads that Missouri sells. If the BH was 18, they would be better IMHO, but that is another topic for another day.
A basic summary video.
https://www.youtube.com/watch?v=eyry4sC3PNgJames is as right as rain that "When hunting with a subsonic cartridge you loose the damage that high velocity creates so it either needs to be very very heavy and preferably flat blunt tipped or a bullet designed to fracture and cause multiple wound channels."
Mark (Immortal Arms) and Syd started me off on .208 AMAXs... I now consider that projectile to be a very poor choice for .300B/O.
Good projo for .300WM... .300RUM, but not enough velocity to do anything, but punch a clean simple hole.
Also, another topic for another day... IMHO the Nosler E-Tip is a superior built bullet to the A-Max...