Thanks.
I am holding out to write a second one. Developed one load, but didn't experiment much since. Bit busy with .308 Win loads at the moments, but I hope to have better info for this in March. 77gn Scenar are what I'm trying now, but 73gn should be better.
Still not tried it beyond 300 yards, but it looks very promising.
It is a pity the local ranges at Bulford seem to stop at 300 yards, as they all tend to have far less wind than Century.