Welcome aboard
Like the gents before me mentioned "long range" is a subjective term.
Shooting a coyote , off hand , with a light weight 223 , in a 20 mph cross wind 400yds is a looong shot for me and probably most others.
A feeding Bull elk standing broad side 1000yds out , no wind , shooting one of Kirby's 338 Allen Mags prone , I'd call that chip shot , while Kirby could likely double that range and call it easy.
Using a custom built rig chambered in one of the hot mags with a high BC bullet will get you to 1000yds easly on deer. But it also can be done with a cheaper factory rig , I've seen a few bone stock Savage BVSS in 300 win mag shoot 1/2 moa at 600yds with handloaded 210gr Berger VLD's , that rig with that bullet will be way more than "Bucky" can stand out past 100yds.
I made my longest kill this past season on a deer a stones throw from 1000yds shooting a built up 260 Rem , so you don't have to have a big mag to get you their it just helps a bit. I do more hunting down here with a 20" barreled TC Encore in 308 , its light short and accurate anything within 400yds is done for , a deer at 600 alowing me to get a solid rest , nothing but slow walking and soft music. So you can get away with a bit less as long as you know the gun and what its gonna do at that range.
Again welcome aboard
don't be scared to ask about what you don't know and don't be afraid to give your point of view , right wrong or indifferant , "Len" the resident moderator is a great guy and doesen't try to control the board like some Nazi grammer school English teacher. Their is a mass wealth of knowledge here as well as some great gun builders and just about everybody I've encountered has been more than willing to help you.