Spikebuck said:
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When in the first notch a branch would have to pull the hammer back to the fire position and something also release the trigger. Not fool-proof, but a much better proposition than having the hammer down on a cap.
That kinda depends on what style of lock the gun has in it.
If it is a simple lock without a fly in it, if something pulls the hammer out of the half cock notch and raises it up to the full cock notch without reaching it, the hammer will fall back into the half cock position.
If the lock has a fly in it and something pulls the hammer out of the half cock notch and raises it more than a little bit towards the full cock notch without engaging it, the hammer will fall until the sear hits the fly.
Then, the sear will then jump over the half cock notch and fall completely onto the cap even though no one is touching the trigger. :shocked2:
This "jumping over the half cock notch without a finger on the trigger" is what a fly is designed to make happen.
The only really safe way to carry a loaded gun is if the nipple is left uncapped or the pan is left unprimed and a leather stall is placed on the frizzen of a flintlock.
Of course, most people won't accept this so the half cock is better than nothing.
Using the half cock, and being mindful of what your carrying and the possibilities of it firing when you least expect it are about the best that can be done.