Pure b'wax is pretty hard, I wouldn't attempt for the c&b. A mixture with a high temp resistant oil does soften it. I mix b'wax with peanut oil for some of my patches on ml rifles. Also have heard of using Sperm whale oil for same but it is very rare stuff these days. However, unless you have beekeeping friends who give to you, beeswax is fairly expensive. I have heard of rolling out (when warm) and cutting into plugs or wads. Should work OK but is still expensive.
Very popular at the serious pistol competitions is water pump grease. Holds together and is just firm enough to stay in cylinders.
Last choice is Crisco. Just plain messy and wuthluss. Too soft and runny in hot weather and too hard to use in cold. Has no redeeming value except low price.