Best Shield for bumping? (distance)

What is the best shield for bumping, as in which will get the best launch? Is it just star dependent? 5* > 4* or is their more to it?
I have not really tested whether certain shields are better then others for bumping. I have noticed that my L10 4* Sinister Skelly will send enemies much further then my L10 3* Swiftstrike, but failed to think about it while they were both 3*.

This is purely on what a friend mentioned in passing and experience but he said that his Ironmight shield had an awesome bumb range. This appeared true as from what ive seen while playing with him it is better than the barb (5* version) which i use.
Hope this has some value.

That is interesting. Where both shields heated to L10?

Possibly, the iron-might for sure as he has had it for months there is a chance my barb shield was not as this was a while ago.
Might be a subject worth testing in general.
Plate shield series has the best shove distance. It can can push Lumbers around for good distances even at 4* (Heavy Plate Shield).
It looks AND acts like a riot shield!

Wonder how the Ancient Plate Shield compares? or the Omega?
I'd love some info on this too, but as me and my buddy both have a 4* barb atm i couldn't really help :[