if i wanted to put together an ar for target only action, 500 to 1000 yds, thought about 6 mm, 308, and 338 lapua, anybody have any practical experience or ideas. not 100 % sure i'm gonna do it, just kicking it around.
This a no-brainer. The 6mm Creedmore. Don't even consider the 338.
The 308 is the second choice.
Of course, you know it will be the AR10, not the AR15 platform?.....
And yes, I have practical experience with 1000 yard target shooting.