Re: New Member Checking In with some questions
Actually, at sea level you're going to have trouble with M118LR out of a M24 at around 1000 yards, not meters, and bullets often start to display transonic effects at ninety percent of the speed of sound - which is why the military considers the .308/7.62X51 to be an 800 meter round.
However, with better match barrels, you should still be OK at 1000 yards, but not at 1000 meters, unless you're well above sea level. And my experience with cans is that it doesn't effect muzzle velocity enough to make much difference.
If I really wanted to get to 1000 yards, I'd go with the 21 inch barrel. I doubt that you'll get to 1000 meters with any barrel.