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In Quigley Down Under (1990) there is a scene where Quigley displays his capabilities of long range shooting with his rifle by shooting a bucket. In the scene, Quigley describes his weapon.

Marston: The legendary Sharp.
Quigley: You know your weapons. It's a lever-action breech loader. Usual barrel length's 30 inches. This one has an extra four. It's converted to use a special .45-caliber, 110-grain metal cartridge with a 540-grain paper-patched bullet. It's fitted with double set triggers and a vernier sight. It's marked up to 1200 yards. This one shoots a mite further.

The scene in question can be viewed on youtube:

So what exactly is the purpose of the double set triggers?

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Reduced trigger pressure

At first I thought it was just Wild West techno babble to fuel a badass boast about his amazing weapon.

But lo and behold... there is a reason for it, as explained on Wikipedia's page on triggers.

A set trigger allows a shooter to have a greatly reduced trigger pull (the resistance of the trigger) while maintaining a degree of safety in the field compared to having a conventional, very light trigger.

[A] double set trigger accomplishes the same thing, but uses two triggers: one sets the trigger and the other fires the weapon. Set triggers are most likely to be seen on customized weapons and competition rifles where a light trigger pull is beneficial to accuracy.

So in short: it allows him to have a very light trigger pressure (which makes it easier to maintain accuracy) while at the same time not having his rifle go off at every bump, jolt and shove.

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    One would think such a sensitive weapon would be damaged by using it as a club... – Ghotir Oct 18 '16 at 20:33

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