The .318 WR load he used would have been a 250 grain solid.
I think if you were using 220 grain solids in .30/06, it would work just fine. But I read somewhere someone was once culling elephant with a Garand and military ammo, and that worked...
But for a .308, others have used SLR's for elephant culling with 7.65 ball, and that would have been 147 or 155 FMJ's.
