If you're referring to my video demonstrating the changes of sniper spread, it is very rare that I (or anyone for that matter) gets those kind of kills. While it is easier to kill from close range than mid range, it is easier to kill the sniper from mid range, so don't let them get close. I also have a hard time getting close kills with ravs and pics myself.
Any character can kill a sniper, or anyone for that matter. It just depends on aim, skill and the level/situation.
Engagement circumstances and such are important.