Bart B. I only shot BR and all my actions were glued in on my light/heavy rifles.
As to what happened in the 60's not sure what your talking about unless you can name names and where matches were held as their are still some of the older BR shooter/gunsmith around.
In 1971 Ralph Stolle was making limited number of his Panda flat-bottom aluminum receiver. From my understanding 60's few custom action from Weber,Sherman,Hart and Shilen(made in New York) http://www.riflemagazine.com/magazin...117partial.pdf
I had few action that had been sleeved but not for what your talking about as mine never had recoil lug same with lot of BR actions that I used.