I shoot "Combined Services" match which is basically ex-military rifles in original military configuration and mostly bolt actions, and 8mm isn't a popular cartridge there either. I guess this is because the ex-mil ammo has dried up (although 6.5x55 is the most popular and there's no ex-mil ammo for those).

I have two ex-mil 8mm bolt actions myself (a 1903 Turk and a 1904/39 Portuguese) and have been wanting to try them out hunting but they are not a high priority so haven't done this yet. I've used a 308 Israeli Mauser in original military config out hunting and it performs well. It has been my "spare" backup rifle in case my usual rifle (Remington in the same calibre/cartridge) breaks - it never has (I used the Israeli to try it out and it was handy at the time).