The only shootable 7mm rifle I own is a Spanish M1916 short rifle with a much humbler parentage, but it's still fun to shoot. Paid $15 for it back around 1995. I have another 7mm, a Brazilian Mauser, but the bore is so bad I don't shoot it.

Regarding its use on elephants, it all depends on shot placement. I think the game control people in Africa use 7.62 NATO on elephants with brain shots.