Take this for what it's worth. When I started shooting long range (1000 yds) type matches the top guys told me to buy a .308 if I wanted to really learn wind calls. Why? Because I would learn to read wind vs trying to "out BC" the wind. Makes sense when you think about it. Many people, myself included, initially think they can "BC" their way around the wind. Doesn't work.@Map 1 @J Batt
I hear you both on the 6.5 not being an entirely better long range cartridge in terms of terminal performance. I'm not as stubborn as some in this thread would like to think . I think the 6.5 out shines the 270 in 2 places: 1) higher BC reducing wind drift 2) affordably of ammo. If I go the route of having only one gun for both practice & hunting, this may be it. Even if this means reducing my max effective range.
I'm keeping the .270, and will always have it. And if I am adding another gun, I think there are some more benefits to have by adding a different cartridge
To expand a bit more before I get hammered; as @J Batt and others have mentioned. The wind has made a fool out of me a lot and is a heavy consideration on my overall cartridge choice. Maybe the wind is still even making a mental fool of me as I mentally weigh cartridges based minimizing the effect of the wind. The thought here is this is a consideration of what I consider a "forgiving" setup. In the field I'm a hold over for wind guy. This does not mean I will ignore wind and take shots I think are bad or high risk. But in a light wind scenario, I think there is a greater benefit to a higher BC round. Anyone; feel free to tell me I'm wrong here.
I also hear the argument that without that 2000+- shots a year, I have no business in the 600-800 effective range. Loud and clear. I understand that a setup alone does not get me there, and that I have a ton of practice to do before I consider this range. But I want a setup to work my way towards that goal.
To those that recommend a two gun approach: .223 and an another cartridge. I hear you, it is a consideration. My hesitation is that I do want a pistol grip style chassis system. I shoot my AR a lot and think my shot process is much better ( more comfortable). Just a preference. Because of cost, its less feasible to put together two "identical" setups. Again I would prefer the 1 setup or 2 identical setup approach; but what are some issues with the majority of practice with an AR? Maybe shooting a few hundred through the AR for every 20 from the hunting rig, or shooting a couple thousand through the AR; then switching solely to the hunting rig a few months out?