Re: 6.5mm-06 or the 6.5x284
I've never played with the 06' version but I do love the 6.5x284. When there is equal or near equal potential between a long skinny case and a shorter fatter case, I'll take the shorter fatter version. It is my opinion that they burn a bit more cleanly and efficiently. That said, it's just my opinion. Also, I prefer short actions if at all possible and despite the popularity of it being used on a long action I have found a short action with a Wyatt box mag to be plenty. The standard reasoning behind seating bullets so far out is for case capacity. In all reality, unless you're going to pack retumbo to the hilt, you can't fill the case up with the most popular and proven powders without having a bomb in the chamber. 51-53 grains of 4831SC leaves air in the case as it is. Even with a COAL of 2.990" which is about all the extended box will feed smoothly. H4350 utilizes even less load density. Those 2 powders are widely used in this case for a darn good reason. RL22 is maxed out around 53-54 as well. The other reasoning is donuts in the bottom of the case neck. Guys don't like to seat the boat tail/bearing surface beyond the neck/shoulder junction. A K&M neck turner will remove any donuts. You don't have to turn the neck either if you choose not to. Touching the lands is also popular. A custom barrel can be throated to any dummy round leaving no serious reason to build one on a long action.
Ironically, I'm having one put together on a long action as we speak. It just so happens that the action I have available is a long and it's bedded to my favorite stock. I prefer a short action but am happy to use it on a long one.
Long range shooting is a process that ends with a result. Once you start to focus on the result (how bad your last shot was, how big the group is going to be, 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.