All hunting was banned during the late 1970s in the land of the Nilgai. My old shikari continues to cull blues despite this. We have in our days taken bluebells in thousands and not in dozens.
Take my advise or leave it but do not use a 45-70 or a 458 or 465, 470, 475, 577 etc. Apart from the 45-70 all these are excellent weapons in thick jungles. Indeed you may kill an elephant with a 275, but this does not make it the ideal rifle for dangerous game.
From what I have seen the 375h&h is perhaps the correct choice for shooting blue bull.
A 458 win mag with 1959 full load; same striking energy as the 470 NE , will only penetrate 3.5 feet into the spine from behind. Indeed a paraplegic blue bull will attack you following this unfortunate bullet placement. A 22lr behind the ear where the skull is cellular and weak will suffice as a coup de gras.
