Thanks for that @danmac, that’s the sort of thing that I was looking for.
The main reason for thinking of using a 6.5-284 was just to be different. I try not to follow the norm and get what everyone else has. As an example when I brought my 6.5x55 they had just come into Australia, everyone else was using either a 243 or 270. I coped a lot of flak by buying it instead of the norm (not that it bothered me) as there was not much out there about them. Now days they are as common as can be.
I did see that most user’s are only getting around 1000 rounds before rebarreling and that the only real gain over the 6.5 Creedmoor is about 150 -200 fps. Another calibre that I looked at was the 6.5x47, again not much in it.
Things like brass availability etc will also play a part as 6.5 Creedmoors are very common where as the 6.5-284 are not.
At this stage I am just toying with ideas and seeing what thoughts are out there.