O.K. I googled it, and it wasn't readily available, but I know back in the 70's was when they took the high powered rifles off the table because of property damage and manslaughter issues. Seeing and Hearing opening day when the sun comes up, could you imagine hearing a bunch of yay who's popping off high caliber rifles at phantom deer because they want to hear the gun go boom? I don't want to live in that free fire zone. Sorry to lead to some info that you might have to go to the library for, but I was alive and around then...
"high power rifles" were never on the table. Since deer were re-introduced in the '50s it's only ever been shot guns. The reason for this, was so fewer deer would be taken due to the limited range of the foster/berenke slug, thus allowing the population to grow.
I don't know what you're remembering, but it may be a bit foggy. Perhaps someone wanted to introduce center fire rifles, and people speculated wildly about blood in the streets.