When I hunted with a percussion rifle, I didn't do a few things, that others here seem to do all the time.
a. I don't "BUST" brush. Instead, I look for and follow game trails. I don't bust brush because I don't want to telegraph my location to every animal within 1/4 mile!
b. I don't move fast. Again the noise factor. MOVE AS SLOW AS A TREE.
c. I don't carry my gun with the hammer on the cap when moving. I instead put the hammer on half cock, and either put my dominant hand( the one that will pull the trigger) BEHIND THE HAMMER to prevent it from moving back out of the half-cock notch, OR in front of and ON TOP OF THE NECK OF THE HAMMER, to prevent any brush from lifting the hammer up, and OUT OF the half-cock notch, then dropping it to fire the gun.
I do think you can buy the kind of device RB suggests, or make your own using a .30 carbine cartridge casing. I also think the idea of using a thick, soft disc of leather, rubber, felt, etc. on top of the cap, with the hammer lowered down on to the disc will also work as a "Safety" if you insist on doing "a,b,&c", above. :shocked2: :hmm:
Putting the hammer down on your capped nipple when Sitting, is safe enough, given those circumstances. It makes no sense to do the same thing when walking around.
In the event of a fall, or slip as you are walking you not only lose control of the gun, and your balance, but you lose control of the muzzle of the gun.
In the event of an UNINTENDED DISCHARGE, you set yourself up for an UNINTENDED HIT! :shocked2: :shocked2:
:nono: :shake: :barf: :redface: :surrender: :thumbsup: :thumbsup:
BTW: You can teach yourself how to fall and not fire your gun. Obviously, keeping your finger off the trigger IS FUNDAMENTAL. But, even with exposed hammer guns, you can learn to control them when you are falling. I have my Hunter Safety Students practice falls-front, back, and both sides, holding a broom instead of a gun, so they learn how to keep that muzzle pointed in a safe direction, regardless of the direction of the fall or slip. Keeping the hammer on half cock, and either jamming the web or index finger against the back of the hammer, or using the backside of my hand over the neck of the hammer while wrapping my large hands around the barrel and stock has served me well. If you have small hands, I recommend holding the gun with your web, or side of the index finger behind the hammer. :hmm: