I've just found the website of the designer, Werner Reb, unfortunately the pages are currently only in German

http://www.werner-reb.de/40680/40689.html

Fortunately it doesn't take a lot of language skills to decypher his table comparing the ballistics of the 8,5x63 R with the 7x65 R, .30 R Blaser, 8x57 IRS, 8x75 RS, 9,3x74 R - quite impressive!

http://www.werner-reb.de/media/ca2125a65d73a503ffff8177ac144220.doc