yeah, well, Herter's bullets were the best, they told you so...repeatedly,,
Was that 70gr one of the wasp-waisted ones??
If a varmint bullet acts like a varmint bullet it will create a horrific surface wound on a man sized target, and may not reach the vitals. If it doesn't, it will generally act like any other bullet and reach the vitals and probably, beyond.
A nasty shallow wound quite often is enough to get a human attacker to change their mind. A round penetrating a vital spot doesn't care if they change their mind, or not.