Great rifle but the 26in barrel is overkill for a .308 I feel. You will sustain about 100fps as opposed to a 20in like the sps tactical.
It depends on the load. For some 155gr lighter loads I agree at 20" you are almost pretty much done burning the load but for the heavies you can actually squeeze some precious FPS, and again depending on the purpose. Even palma type of loads use longer barrels but you have to decide if a little margin is going to compensate for the extra length and weight for your purpose. Also the weight is not necessarily always a bad thing.
Also the 20 inchers can be more accurate with a wider range of loads. All other things being equal a shorter barrel is a more accurate one.
It doesn't mean that a longer cannot be as accurate but the tune of the barrel is going to interfere more.
In all shooting this is a world of trade offs of some sort. I like the portability and accuracy out of the box of the 20 inchers police type of systems but
I can see the benefits of a bit extra lenght. Not so much in NYS where finding a place to shoot 800 yards and beyond is not easily found.
For me means almost 2hr drive each way to shoot 800 to 1100 yards so sadly I cannot do it that often but everyone has different circumstances.