In the late 1940's and early 1950s' the Pom's develop a .270 weapon system that they wanted as the standard NATO round,Their studies at the time had shown that this was in their view the ideal size of round. But they were overruled by the US military. Maybe they were to far ahead of their time?
It was .280, the rifle it was designed for was the EM-2, there was a program on discovery which mentioned this rifle and round last weekend, I remembered your post so here is the wikipedia entry on the system, it looked really interesting and as you said probably before it time, but what goes around comes around.
EM-2 rifle - Wikipedia