Each one of those metals has quite unique properties. 316L is very hard and brittle but very corrosion resistant. Not quite suitable for a flexible whip. 17-7PH is less corrosion resistant, but very flexible and returns back to its original shape after bending. Very different metals with very different purposes.
Which I why I provided the attachment in post 27 identifying several different variants of stainless steel and their respective strengths and weaknesses. Those who are interested can read it and maybe learn a little. Those who aren't can just buy a 102" whip or a magnetic mount.