I use a wad twixt ball and powder, often in the heat of the Utah desert, and have never noticed a change in power. Perhaps it's in the lubricant.
I use an old recipe:
1 part canning paraffin --- sold in grocery stores in 1 lb. blocks
1 part mutton tallow --- sold by Dixie Gun Works. I've tried lard and other greases and nothing works better than mutton tallow. It's worth it.
1/2 part beeswax
All measurements are by weight, not volume. I use a kitchen scale to measure 200/200/100 grams of ingredients then melt it all in a quart, widemouth Mason jar placed in three or four inches of boiling water. This gives it a double-boiler effect, which is the safest way to melt waxes and greases.
Allow to cool at room temperature. When cool, screw the lid down tight and store in a cool, dry place.
This creates a medium-hard lubricant that will soften a little in heat. The paraffin is important, I believe, because it stiffens the felt wad somewhat and helps it scrape fouling better.
I bought a large sheet of 100 percent wool felt, 1/8 inch thick, from Durofelt of Little Rock, Ark. Visit its site at
www.durofelt.com/products.htmlAsha, a very nice lady from India, runs this felt business out of her home. She has relatives in India that run a felt plant there so she gets the real stuff at good prices.
Order soon, as Asha sent me an email recently that she's closing business soon so she can fly to India and visit relatives. Won't be back until January. As I recall, I paid $27 for a sheet 48 inches long and 30 inches wide. From it, I'll get thousands of .31, .36, .44 and .50-caliber wads.
Commercial wads are about $8 per hundred, so you see it's very cheap to make your own. Buffalo Arms has the best deal on wad punches, at $18 each.
I almost always use a greased wad in my loads. On rare occasions, when I shoot with the thermometer above 105 or so, I also put grease over the ball. The extra lubricant in this dry, desert heat keeps the fouling soft and more removeable.
I use CVA Grease Patch as a lubricant. It's very effective and comes in a convenient squeeze tube with a long neck, which is great for getting into the confines of a cap and ball revolver.