Re: Long Range question
Theoretically, on paper you are right. 1/2" groups at 100 would equal 5" groups at 1000. But in the real world it dosen't work that way. As Lobo said there are too many things that can change the trajectory. Many of the variables start to become more apparent around 300-400 yards and at about 800 to 1000 they tend to take another swing twards the random. Again, as Lobo said .5 @100 is a good place to start then work up from there.
Always try for better.
GRAVITY. It's not just a good idea. It's the LAW!