I'll suggest by-passing the Winchester, or exposed hammer lever guns.
With the exposed hammer lever guns, chambering a round involved fully cocking the gun. Putting the gun on half c o c k requires holding the hammer, and pulling the trigger.
Which goes fine most of the time, except for that one time your thumb falls off the hammer and shoots your transmission. After that -the gears will grind just a little bit when shifting into third gear, and new transmission pan required after the fluid leaks out.
For any type of action, it's nice to load the gun and keep the trigger on safe.