Yes true, but that isn't the rifle and calibre but the choice of bullet.

Don't see the need to take a second rifle, when a different bullet will do even better.

I've only used my .30-06 for plains game in Africa. Plus my .375 and 9.3x74R and .450 on other hunts. Borrowed a 8x68S another time, which would be my choice as a plains game rifle probably from now on.

Never taken a leopard but have briefly hunted them a couple of times when sign was 'spotted'. (pun intended)