Hello KevinF They were Nosler Ballistic tips. I do not recall ever having bought Ballistic tip bullets for reloading in .270 so I believe that they must have come as a part-box with the rifle along with some RWS for testing when I was in the process of purchasing it.
In that case I suspect that the ammo would have been Federal. I did not have access to a chronograph at the time.
I chest-shot two hinds - two shots each at approx 120 yards across a hollow and after examining the results, never used them again, but your comments on this bullet model are proven correct, certainly in .300 cal. My neighbouring stalker gave up on them as they were causing too much damage. He slowed them down a bit but the results, whilst killing quickly, drew some disapproval from the game dealer.
The RWS were dead accurate and I used them as a benchmark for building up future loads if I wanted to accuracy-test the rifle first.