Not every reliable rifle will make accurate shots at that range. AK's are very reliable, but the ballistics on the 7.62X39 are rotten out past 250 yds. Even with the appropriate round, there are variables in your eqiupment that need to be worked out. That's just to get the rifle consistent, getting the shooter consistent takes even more work. There's still nothing wrong with the taking the shot, if you know you can do it.