Actually Blaser offers the following loads:

7 mm Blaser Magnum: 9.1 g / 140 gr Nosler Accu-Bond
.300 Blaser Magnum: 11.7 g / 180 gr Barnes TTSX (lead-free)
.300 Blaser Magnum: 10.7 g / 165 gr Blaser CDP
.338 Blaser Magnum: 13.6 g / 210 gr Barnes TTSX (lead-free)
.338 Blaser Magnum: 13.0 g / 200 gr Nosler Accu-Bond
.375 Blaser Magnum: 17.5 g / 270 gr Barnes TSX

They claim reduced recoil. Using cases, they claim higher potential for reloaders.

Nosler and Barnes were apparently part of the testing. This is a joint venture between Blaser and Norma! Just like Ruger and Hornady!

Imagine a potential handloaded 7mm 140gr @3300FPS; no belt; LOW gas pressure, increased accuracy, better cases
Imagine a potential handloaded 300 165gr @3300FPS; no belt; LOW gas pressure, increased accuracy, better cases