Homer - when you said:

"G'Day Fella's,

Norsk, I have never owned a Blaser R3/R8 bolt gun myself but several mates/customers do, and they love them.

They did have some serious issues, when as you mentioned, the bolts came back into the faces, of sereral of their users.
From what I was told, these were all chambered in .300 Weatherby."

You were spot-on - I wonder why it was .300 WTBY?