Howdy Again
If you need a compression die, you are really using more powder than you need to. As I said earlier, all that is necessary is to put in enough powder so that when the bullet is seated, it compresses the powder by about 1/16" to 1/8". Forget trying to stuff 40 grains into modern cases. Modern cases have less case capacity than the old Balloon Head cases and will not hold 40 grains without more compression than is really necessary.
Depending on the bullet you use, and the brand of powder you use, 1/16" - 1/8" of compression will mean somewhere between 33 and 37 grains of powder.
Yes, Black Powder burns hotter than Smokeless, so the gun will get hot faster. If you have to wipe down the gun every 24 rounds or so to keep the cylinder spinning your bullets are not carrying enough soft, BP compatible lube.
I can shoot 45 Colt out of my Colts, clones, or Rugers all day long and never have to wipe anything down to keep them from binding.