I also have a friend with a Savage B-mag, I got it for him at auction, new for a very good price about 3 years ago. He was also lucky enough to buy alot of what Chris Potters had in stock of the ammunition at the time and he treats it more like a centrefire, so the rounds will last.
I don't often have contact from Edgars, as I don't hold an account.. however same said person who purchased the Savage B-mag was the person to get this information from Edgars, as he works for CH Westons in Brighton. I don't recall a specific reason but my guess would be popularity..
Another example of something being no longer imported (or I believe discontinued in this instance) is the 25gr NTX by Hornady for the .22WMR. That was, as far as I know, the only available lead alternative available for it? I however speak from personal experience of that 22wmr NTX bullet, when I say that they have tempremental terminal effects.. I head shot a rabbit at 50 yards, to merely find it blind in one eye. I shot a rabbit in the chest front on at 130 yards, only find the whole bullet untouched in the skin of the stomach fur. Some years ago now.
I digress anyway! I was also very tempted at the time to buy a 17 wmsr but I'm glad that I didn't. My suggestion to those who own one, is perhaps up your ammunition limit and buy what you can from who has it left and make the most of the rifles you own.
I completely agree that it's a shame that there weren't many offers of those manufacturering rifles in this chambering and that it may have meant a more popular cartridge in this country, if so. I don't believe Savage rifles are generally very popular here generally? When compared to other manufacturers.