My experience with Ackley Improved cartridges is limited to just two.
.30-30 AI and 7x57 Mauser, AI.
Both of these show a marked improvment, but then they are not already fat with little taper.
I have been very impressed with the speed and accuracy of my old FN Mauser with the Shilen barrel, Canjar trigger and 7x57 AI chamber.
Wildcats have traditionally been done for reasons other than just strict practicality
.