The rainbow was mentioned as the 35 whelen`s are not really noted "for a flat shooting out there long range stuff cal",they built their rep on the hard hitting in closer type stuff.. and compared to my 35 cal IE the 358 NM it is indeed a rainbow to me.It`s basically that a comparo with the lot flatter stuff that crudely suggests rainbow.
I have rolled a lot of stuff with my 7mm mag and 300 wm,no rainbows in either of them.

In saying that I would be extremely happy to carry a 35W in my claw whilst sambar hunting.