The SGC guide to 6's sniper:
step 1: don't play sniper it's an aids class and everyone will hate you
step 2: run machina and jarate since they're dumb and broken as shit. if you're good at sniper you can run rifle if you want but my advice isn't need then
step 3: if you see a scout,medic, or solly/demo in the air, bodyshot them for 173 damage
step 4: the secret to sniper other than hit ur shots is to play super gay so either be a giant weenie and bait your whole team or do something incredibly stupid and aggressive for a glory pick depending on the situation
step 5: if you're going to die throw jarate at whoever killed you it's honestly such a dumb weapon thanks b4nny
step 6: don't be a dumb idiot sniper main and get off sniper after you die or win the last hold