With my older CVA, .50 caliber cap-lock that I shoot the most, I remove the screw from the drum, then remove the barrel from the stock and sit the barrel (butt first) into a small bucket of lightly soapy, hot (130º) tap water. I find the hot tap water, dab of liquid soap method works for me.
The only thing I do that might be "different" is after swabbing the dirty barrel with a clean patch on my jag, I run a .50 caliber sized, nylon bore brush up and down the barrel several times, wetting it in the hot, soapy water after a few "swabs" and running it up and down in the barrel several more times.
Then I throw out the dirty water and replace it with clean water and put a new, clean patch on the jag, and with the bottom of the barrel still in the clean water, I clean out any remaining soap scum that might still be in the barrel. Then I once again throw out the semi-clean water and replace it with the hot, clean tap water (130º) once again... and, with the barrel still in the water, I swab the barrel with another clean patch on the jag several times.
Then I blow air pressure from a small double-tank air-pressure unit (available at Harbor Freight for about $100) down the barrel first, then when the barrel seems dry, I put the air-gun's nozzle up against the empty drum's screw opening and blow into the opening clearing the flash-hole, nipple and flash channel until it is completely dry, when I give the bore (at the muzzle) another "shot" of 100 pounds-per-square-inch air to insure the bore and flash-channel is as dry as possible.
At that point, I slide a small light down the barrel and look carefully at the lands and grooves to insure no further "gunk" remains (and the bore is usually very clean at that time). Then I slide the light out of the bore and shut it off.
Then, with a small, pressurized can of Ballistol, I give the flash-channel a quick "shot" of the Ballistol oil, then I blow the jag dry and put a clean, fairly oily (Ballistol) patch on the jag and run it up and down the barrel at least 6 times, changing it's position after each down & up movement of the jag.
Then, I blow the excess Ballistol out of the bore and the flash-channel, then slide the little light down the bore to insure it looks very shiny, then I remove the light and slide another clean, oily patch down the barrel to insure all of the bore has a light coating of Ballistol on it, clean the debris out of the stock and wipe the exterior of the barrel with the clean, oily patch I used on the bore. I then re-insert the barrel, lightly oil (Ballistol) the wedge and re-insert the wedge in the slot in the stock and the job is done.
I then put a folded over (several times) soft paper towel on the carpet behind the door to my computer room and place the rifle, muzzle-down on the paper towel, to allow any excess Ballistol to drain out and not "puddle" in the flash channel. I lean the butt-stock of the rifle up against the woodwork behind the door and the job is finished.
The next time I go to the Club's rifle range to use the rifle, I fire one percussion cap close to leaves and debris on the ground to insure all the Ballistol is gone and the flash-channel is cleared, load the rifle with 47 grains of Goex FFFg, add a thin vegetable-fiber over-powder wad on top of the powder charge, add the lubed, patched ball, add a cap to the rifle's nipple... and start my shooting.
Total cleaning time: ± 20-25 minutes.
Strength and Honor...
Ron T.