I am aware of only the following calibers in the B78: 22 250; 6mm Rem, 7mm Rem Mag; 30 06 and 45 70.
It happens. Does not add any real value.
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
7mm Magnum and 300 Winchester Magnum
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
Marketed as the B78, this gun was made in Japan from 1973 thru 1982. The model was reintroduced as the model 1885 in the year 1985
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
The B78's were made for Browning by Miroku of Japan from 1973 to 1982 and the values vary a bit. A moderately used 78 in a popular caliber will run from $800 to $1500. Their popularity is apparently on the way back and Winchester has started making a Model 1885 which is basically the same gun with less flashy wood and not many chamberings. Browning had made an 1885 Model back in the 90's for a few years. I purchased a mint 6mm B-78 two years ago for $850 and thought it one hell of a deal.
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?