On my 4 African hunts, I've been involved in taking 6 kudu. I took two with a 375 H&H, 300 gr TBBC's. My two sons each took one with 30-06s, 180 gr TBBCs, and two friends each took one with 300RSAUMs, 180 gr. They all worked just fine. I would not hesitate to take a kudu with any 30 caliber rifle. Inside 100 yds I'd have no problem with a broadside shot with a 30-30. Put one in the heart lung triangle and it will go down.