I noticed the hunter was shooting a 375 H&H. This would seem to me to be about the minimum caliber for tiger. They are a tough and BIG cat. The famous tiger hunter of the 30s in India, Jim Corbet, used a double rifle in 450/400 as his primary weapon. A fast handling rifle with a quick second shot was the best combination for these awsome cats.
"I have made it a hard and fast rule to go alone when hunting man-eaters, for if one's companion is unarmed it is difficult to protect him, and if he is armed, it is even more difficult to protect oneself."
Jim Corbet
Man-Eaters of Kumaon...The Champawat Man-Eater...