At lease fifty guys have shot their first 800 yard groups on my range, usually with one of my guns. Most of those guys were just average shooters and to the man anyone of those first shots would have killed an elk. There is a lot to be said for dry firing and parallax free scopes. I Keep an 8 twist 6BR rifle sighted in for 800 yards and keep rounds loaded for it for the express purpose of letting people who visit to shoot their first long range shots.