Re: 308 vs 30-06 and other rounds? WHY is a 308 better?!?
There's no doubt that at max potential for each the 30-06 will have higher velocities. That being the case, the 308 today, with modern powders and such, can far out perform what the 30-06 could do 25 years ago. With the insane accuracy, consistency, high BC projectiles and higher velocities than ever before, the 308 is a serious LR round. Be it match, hunting or sniping. With the excellent modern day capabilities, my opinion is that if you make the switch to a long action, make it worth your while. Go for a 300 win.
25 years ago with the bullets and powders available it took the large magnums to hit the 1000' pound mark at 1000 yards. Now there are 308 loads that hit with 1000 pounds at 1000 yards. Granted, this is the upper limits but illustrates how far we've come with bullet design and velocities.
My current primary 308 is a true SAMMI spec rifle. It shoots federal gold medal match ammo right at 2600'sec. Right where it's suppose to. I have no interest in pushing hot hand loads through it. My hunting 308 has fired 168 amax's @ 2950fps with double base powders and a 26" barrel with 1/4 MOA accuracy and zilch for pressure signs. even using cheap cases. It's also peaked over 2700 with the 200smk. 25 years ago this was a pipe dream for either of these cartridges. I decided it seemed morally wrong to push the 168s to 2950 so I settled on 2833fps as my go to load for that weight. Still higher that thought possible back then.
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.