Sorry if this is a repeat post but I hadn't noticed till a co-worker was asking about some Federal Fusion 12ga slugs that Federal has greatly increased the number of rifle cartridges they offer with the "Fusion" bullet.

Fusion Rifle Ammo Lineup

Apparently, Federal is offering .375H&H, .416 Rigby, .416 Remington, and .458's in both Winchester or Lott flavor.

Probably not anyone's first choice for a DG hunt but prices are a bit lower than "normal" big bore stuff for you non-reloaders.