Fastest way to kill a sentry gun with a sniper rifle?

Question

Say I spot a sentry in the distance, and I take out the engineer. What's the fastest way to destroy the sentry?

1. Shoot a series of slow, fully-charged shots?
2. Shoot a series of fast, completey-uncharged shots?
3. Shoot a series of half-charged shots?

Or is there an even faster way? e.g. shooting quickly without bothering to zoom in.

Answer

According to the TF2 wiki, a fully charged sniper round does three times the damage of an uncharged sniper round. Therefore, if you can get off three shots in the time it would take to charge, then you should go with (2). However, keep in mind that you're going to use a lot more ammo this way, and that gradual damage is often easier for the Engineer to repair than a series of more damaging shots.

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