I just read an article on the A-Bolt in one of the shooting magazines.
Sako was making the actions and barrels for Browning. Joseph Badali designed the BBR to replace the Sakos. The A-Bolt replaced the BBR.
I will have to find the magazine to get the dates. I want to say the BBR began in about 1976 until 1982, but am guessing there.
I went thru the Browning Museum in Ogdon in about 1997 and Joseph Badali was my tour guide, it was late in the day and I had him as a personal tour guide... GREAT expierence for a big Browning fan as myself!!!