They are NOT need for most hunting, but make longer shots easier even in the day of turrets, not always can they be used..
I think that's subject to debate, and depends on the situation. "In the day of turrets" the advantages of magnums (flat trajectory) are canceled out but the disadvantages (recoil) are not.
So what is it that makes long shots easier with magnums these days? It's true that there's not always time to spin a turret (most of the time there is) but lots of scopes have reticles that make spinning turrets unnecessary when time is of the essence.
