I am currently searching for some SN one's.

I just can't find the list where I saw them.

Edit
Just found this on the net dated 2009

buffaloarms.com carries brass and 5 different grain sizes of bullets including the Hornady .330

Also this
HRN 8x56R (.330) 205gr SP BULLET SpirePt PER 100
(Looks like a Hornady bullet and from memory that sounds right).

And PRVI definately make a SP bullet as it is listed on their web site.
B-561 8 mm SP 208 0.33