I used the wonder wads before but never liked them for prolonged shooting. If you were going to take a few rounds in the field they would be okay.
I never tried putting them in the rubber caps before. If I were to try that, I would probably put the ball in first and seat it deep enough to put the wad on top of the ball.
Then, when squeezing the ball out of the cap, the wad would naturally come out with the ball.
If you put the wad in the rubber cap first and the ball in last, I would worry about granules of powder clinging to the wad and making a mess. We need to keep blackpowder shooting from getting too smelly and messy
My pre-loads for the Colt Dragoon use 40 grains of FFFG. So the ball comes pretty close to the end of the tube and there is no room for a wonder wad. That is even for a rubber tube that is 1.5 inches long.
The next larger charge is for the 1858 Remington; using 30 grains FFFG. I took an old wonder wad and put it in the end of the tube to see if it would fit. It was perfect. See the photo below.
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I make up my own lubricant. 1/3 Beeswax and 2/3 vegetable oil or olive oil.
I melt the beeswax in a big pot on the stove at it's lowest setting. Some folks use a double boiler but, on low, my electric stove hasn't given me any problems. I use a ladle to pour the beeswax into a measuring cup. I put 1/3 cup of beeswax in the cup.
Then I fill it with vegetable oil. The oil is cooler than the melted wax and you will see some solidifying taking place. I put the cup in the microwave for a minute then stir up the contents to make sure it is blended well. Then I pour the lubricant in another container to cool.
I also shoot a lot of air guns and save the containers that the pellets come in. They are great for storing all sorts of odds and ends. So I pour the melted wax and oil combination in the empty containers.
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I lost count of how many rounds the container is good for but you can shoot a lot with the small amount of lube in these containers.
I used to use a 50/50 solution of beeswax and oil but found that even in warm weather it was too stiff to work with. The 1/3 wax and 2/3 oil combination is just right in warm or cold weather. Old pop-sickle sticks or
never-used tongue depressors work good for spreading the lube over the chamber mouths.
I get the wood sticks from Hobby Lobby really cheap:
https://www.hobbylobby.com/Crafts-Hobbies/Painting-Surfaces/Wood/Wood-Craft-Sticks---Jumbo/p/23695
As a joke, I made up some labels to cut out and glue over the lids of the used pellet containers which are attached. Please feel free to download them and pass them around.