Others have said take the nipples out, that is one way. On my percussion guns if I want to dry fire I make a rubber bumper and let the hammer fall against that. I dig into my stock of plumbing faucet washers for material. Just make sure to replace the bumper if it starts to breakdown so the hammer never hits the nipple.Can I dryfire my 1851 ,1858 and1860 revolvers without damage to them .
I am going to save you some money. Go to Home Depot and buy some vinyl tubing 1/4 inch OD and .170 ID it cost 4.00 for 20 feet. For Remington revolvers, you will need to cut the tubing .215 inches those will work as bumpers they will also work for small pistol primers instead of using caps. Colt revolvers don't have as much clearance they will have to be cut shorter experiment I am sure you can get it to work. UDP 0.170 in. I.D. x 1/4 in. O.D. x 20 ft. Clear Vinyl Tubing-T10007003 - The Home Depot I almost forgot if you cut this tubing in 3/4 inch pieces you can put a percussion cap on each end and use it for a field caper carry as many as you need in a small tin.I can't believe no one has made a set of nipple bumpers for cap and ball revolvers commercially!
I'd buy a set today.Two sets.