Per Round Cost for Bullets = $0.087
Per Round Cost for Powder = $0.010
Per Round Cost for Cases = $0.000
Per Round Cost for Primers = $0.025

Per round of ammo is $0.12

I use HP-38 powder by the 8 pound jug from Powder Valley, Wolf small pistol primers, brass that I pick up at the range, and 124 jhp bullets direct from Montana Gold by the case of 3,750 bullets for $325 with shipping.

I load them on a dillon 1050 with a bullet feeder and I can pump the handle at up to 2,000 rounds per hour. I can pump out 400 rounds for a match in 20 minutes if I want to move fast. A hundred rounds takes about 3 minutes or so of non stop cranking on the handle. A few minutes here and there saves me 50% of the price of going to the store for ammo, and the load is customized to the three race guns that my family and I use. One of them is an open gun that needs a load that is hotter than the max listed 9mm load (factory is not hot enough) to work the compensator properly.

I used to load 40 S&W on a single stage and thought it was worth my free time to save some money.