Re: 6.5 x284
I don't have a rifle chambered for it, but I have several gunclub friends/match competitors that use it. It is a great cartridge, that really holds its own for long range work.
For me, there is an angel on one shoulder saying "Keep using 308. Its moderate, its accurate, its easy on the rifle, I've never let you down"...... And there is a devil on the other shoulder saying "6.5x284 is flatter, more consistent, the top competitors use it... So what if you have to spend a couple hundred bucks a year on barrels?? Get one!"
So far, I've stuck with 308. To me, its a big bummer to get 1000 rounds out of a barrel. According to the people I know that personally use it, 1000 rounds is max. They say its more like 750, unless you set the barrel back early and often. Unless you can do your own precision barrel work, it seems stupid to spend the money on setbacks every 300 or 400 rounds to get an extra 300 or 400 rounds total from a barrel.
Yes, your mileage may vary, but expect short barrel life. Otherwise, its awesome. Probably worth it.