Well, I don't know all the answers as I'm a brass reloader. But to break it down, if you load 1oz loads, there are 16oz to a pound so that makes about 400 shells per 25lb bag. I'm guessing SG primers are still the best buy when bought in 1000 count boxes at about $30 per 1K. And, your powder (1lb) ought to last twice as long as your shot or more.
I don't have the numbers- but yes, it's worth it if you shoot a case or more in a year.
Have you checked the Lee Load All II? It ain't a MEC, but it'll sure spit 'em out in short order.
Rednecks... Keeping the woods critter-free since March 2, 1836. (TX Independence Day)
I'm going to use the words "clip" and "Long Colt" every chance I get. It grinds my gears to see new members attacked when we all know dang good and well what's being refered to.