Yep but all that extra weight does not translate into the bullet having to travel any more distance to get to the vitals in a sambar than in a big bull tahr or red stag for that matter. If the bullet is well constructed and can punch through those animals it will punch through a sambar or any other head of say African plains game.

There is also tenacity to life of animals that comes into the equation. Our American friends write about how difficult elk are to get down and one needs as powerful a rifle they can handle for the job but New Zealand hunters who have had experience on both red deer and wapati (American elk) say the elk was a far 'softer' animal and many were bowled over easily with the old 303. Different story to the red deer where it is oft said, and I can vouch for it myself, that a big red deer hind is more tenacious to life and harder to get down than a stag.

A good 7mm bullet will easily drop any head of deer, goat or antelope type game provided the hunter does his bit.

Different story when we are talking about animals that maybe dangerous e.g. bears, buffalo, etc. where it is not just a matter of slipping a bullet into the kill zone and waiting for the animal to expire. The animal may cause you to expire before it does so itself so something different is needed here.