Quilly - You have a couple more choices if you want ammo that is loaded to the full potential of that caliber.

Nosler has a 180 grain ballistic tip in 8 mm for whitetails that I was thinking about trying out. These guys would probably load some for you if you are not into reloading your own:

http://www.cpcartridge.com/index.htm

Another 8 mm load I have wanted to try on whitetail is the Norma " Vulcan." The Norma ammo has similar ballistics to the S & B ammo but the Vulcan has a lighter bullet construction than the SPCE. You can get those here:

http://www.sportsmansguide.com/cb/cb.asp?a=70818

Good luck.