Simply crunch the numbers. If you've already amortized the cost of the press, dies and other gear, just add up your cost of components... roughly 10Â¢ for a 115g FMJ bullet, 3.5Â¢ for the primer, 2Â¢ for powder = 15.5Â¢, assuming your brass and labour are free. You might cut a few cents with coated bullets and bulk purchases, but it's a marginal savings at best.
Most reload for the joy of it. It's hard to rationalize it for economy purposes with 9x19mm 115g ball ammo. Wal-Mart steel-cased Tula is ~ $8 with tax.
As for round count.. how about 11 pounds of lead or roughly 590 rounds (.22, .38, .45 ACP, 9x19mm, 7.62x51 and 6.5x55mm). Today, I only spectated with two rounds (one with sand, the other just a primer) of 12g in a starter's cannon.