been using my own 7mm RM rifle on them for over 40 years, I do know a little about it.
So,in reply to your original post, I'm pretty sure I could kill that samba with a 148-160 grain bullet in 6.5
My original post mentions no 6.5`s as below but I also knew that some would disregard the OP guidelines.
Take note that under our hunting laws the minimum calibre for sambar is .270 Winchester, thus no 6.5`s and .243`s
Just because you live in Australia,it doesn't mean you have the monopoly on shooting animals of size!
As if I need to be advised of the above, there has been no suggestion otherwise....oh yes there are far far bigger animals here than Sambar deer btw. Some three to four weight sizes bigger.