My rounds cost $0 a piece because I don't bother keeping track of what the components cost. Buying sucks but them I'm happy when I pull it out to use it so let it be.
I also don't sit there with my spreadsheet and figure out the cost of the barrel degradation with each shot. I guess I could also allocate my range membership, rifle price, the Whataburger I grab every range trip, cleaning supplies, reloading equipment, probably even the fuel cost to get out the range. If I added up everything and figured out that I'm spending $19 a shot I'd probably want to quit the sport
So I don't, I keep shooting, and I stay happy. Easy!