Re: 22-284, 6mm-284, 6.5-284
As far as the 6.5x284, I'm a fan. As far as actions, the 700 SA using a Wyatt box is a pretty good route. I've used both LA and SA and I'm 49.5 - 50.5 in favor of the long but either makes me happy. I've not noticed 1 bit of difference in accuracy or velocity for that matter. You can't fill a case up with the most popular powders any way regardless of where the bullets are seated. You can get 56-57 grains of h1000 in the case without compression with loads seated out way there. You can easily get the same amount when seated to fit a SA Wyatt box with a bit of compression. Velocities should be any where from 2959-3050 with either action. You can also get 59 of retumbo in either but the SA loads are pretty compressed.
Long range shooting is a process that ends with a result. Once you start to focus on the result (where the shot goes, how big the group is, what your buck will score, what your match score is, what place you are in...) then you loose the capacity to focus on the process.