if 400 is good for you, thats great!
just like you can do that with 400, sum people can do that at 1000.
they feel the same way about 1000 as you do 400...
so whats the real difference? answer...there is no difference...same thing. comfortable zone

http://www.longrangehunting.com/
go take a look around there...

these guys are skilled and know their ****.
these guys didnt roll outta bed and decide to do this today...
some will tell ya they been doin it 30 years and are just figuring it all out!
we depend on guys like these to take mile long shots to protect our own.
did ya see the "pirate" thing? where they shot like 3 people, at sea in wavy conditions, on different boats, at the same time?
some guys have it, and some dont...i wish i did, but i aint hating on those that can