I am aware of only the following calibers in the B78: 22 250; 6mm Rem, 7mm Rem Mag; 30 06 and 45 70.
Between 1973-75
You will need to include a serial number to have your question answered.
W73 to 76 and then to current two letter code
No. The B78 wasn't introduced until 1973 and discontinued in 1982 You need to contact Browning. You can get it lettered for 39.50 USD
Browning.com has a sn function under customer service
First built in 1973 and discontinued in 1983, this single shot rifle was initially offered in .22-250, 6 mm Remington, .25-06, and .30-06. .243 and 7mm Rem Mag was added to the standard rifle line and a .45-70 version was added on a heavier frame.
It happens. Does not add any real value.
With a flat screwdriver , their are 4 positions, eject straight out the rear , to the left or to the right, and a stop or catch position.
No
Having trouble identifying the model. In 1979 (date indicated by your sn), Browning produces the BBR bolt-action rifle, the B78 single-shot and the BAR semiautomatic rifle in 7mm Remington Magnum, but none of those had that 117 designation. What type of rifle do you have?
The Browning 78 rifle was manufactured in Japan from 1973 to 1987. It was a high-quality rifle designed for serious hunters and shooters, known for its accuracy and craftsmanship.