Recently ordered two thousand 180gr truncated cone .40 bullets for $140ish shipped. Dunno what hardness off top of my head, but they're not real soft Went to the range today with three batches of 20 rounds each with 0.5gr powder differences. Oh and a barrel snake for fouling
This is just my experience with my particular gun, these particular bullets, and COL. I wouldn't suggest others use these loads. As with any load over the net, take them with a grain of salt and refer to a published loading manual.
At 4.5 grains of unique with a Winchester SP primer - fouling was not too bad.
At 5.0 grains things were absolutely attrocious after just 3 rounds.
At 5.5 grains it was clean as whistle after 20. No leading at all. :tool: