what is the best sniper on battlefiel 1 that can kill just with one shot

[Ourumov13]

The AT Rocket Gun is very effective as well :eahigh_file: 

[SterlingARCH3R]

It depends on the distance and the sweet spot of each rifle. Check the graph and stats on the weapon.

This is a bit of a tangent, but you may like it - in hardcore mode, all weapons will have a one shot kill except in very far distances, so you should try that out.

[VIP-AHMAD-007]

It all depends on your requirements and play style, I normaly ise the Lorance of Arbia or Ny other infentery one.

If you are looking to rank up and to het most kills you may think of joining a hardcore server to enjoy it 😉

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VIP-AHMAD-007

[Moskolonel]

And in mark V you have 2 tank hunter rifle for shooting every things .

[EA_David]

+1 for Tank Hunter.

It's by far my favorite Elite Class, and with that absurd rifle you don't need to deal with petty concerns like headshots or sweet spots. 

As for sane weaponry, as folks are saying check your sweet spot graph and pick the appropriate one for the map/engagement range.

You might also want to think more about your choice of sidearm when playing as Scout. Having a pistol you're comfortable with can help you with finishing off wounded targets, or with getting away when you're ambushed. A quick rifle chest shot then panicky pistol spam has saved me more than once. 

[Its_Travis_199]

In their sweet spot every Sniper does One-shot kills.
Choose one that fits for your Playstyle, and you're good to go!