I wouldn't second guess yourself. 308 is a tremendous cartridge. 6.5 became the flavor of the day when people started winning PRS with it. As I've read over the past couple years, 6mm is the new PRS favorite child (someone please correct me if I am incorrect) so; run what you brung...
I second guess everything I do. Not to the same degree as Carlos, but still...
WT, if you makes you feel any better, I'll be shooting 5.56 at distance. I look forward to cursing the wind.
I'll likely try one of my AR's at long range. Maybe...
Now that I've been outted as a steel-case hater (except for AK rounds !), I guess that I'm going to be shunned, and ignored.
Never