First of all I never move slowly out from behind the side walls of the battlements because this is where every sniper anticipated u to come from, instead I rush out towards the centre to try to spot where the enemy sniper is constantly ducking during the dash. When I locate the enemy I prime my rifle and make random strafing movements whilst I try to take aim as this makes it hard for the enemy to take a shot then when I get the chance blow his/her brains against the wall, if I miss the shot I run straight for the nearest cover, prime my rifle and do the strafing again.
Don't always wait for full prime if u are taking on an enemy sniper, usually a quick low powershot will scare them off and stop them killing u (remember it's the first shot that counts).
Otherwise if no enemy sniper is present I strafe back and forth across a section of the battlements waiting to pick off oncoming enemys and as soon as I sight an enemy sniper dash for cover and then try to take them out before going for another normal class target.
If an enemy soldier or medic somehow manages to get past u hide behind the righthand side of the battlements and prime ur rifle because chances are they will either rocket or conc jump up to get u so when they come u will be ready with the shot and if they lob a grenade u can see it coming and are nearly out of the way.
If an enemy gets on to the battlements and u miss with ur first shot and they come after u prime a grenade, switch to auto rifle and run back towards the respawn door, spray them with bullets as they attack and hold onto ur grenade until about the 3rd beep before u throw because they are likely to be very close to u. Never try to fight an enemy soldier or medic who is attacking u because u will very rarely win.
Strategy by Flatliner
Since 2 fort is probably the most played map in TFC I just thought I'd put up some of the things I do when sniping there.