[I cannot think of a name]

Actually I have seen muskets and other muzzle loaders that had a lock that could be applied specifically for loading or for carrying through heavy brush.

Also, there are many varieties of Mouser, as well as other bolt action rifles, that can have the action cycled with the safety applied. It is always recommended that the safety be applied (action locked) before cycling live rounds.

[SJSAMPLE]

I understand a positive safety, but why would you COCK any muzzle-loader before loading it?