These are what I have settled on after experimenting with high or low powder loads and avoiding leading. The .44 mag full power and .357 full power may cause leading.
9mm Luger
125-gr RN, 4.4gr powder 1590/lb
Projo: 4.2¢ Primer: 2.0¢ Powder: 0.80¢
Total Cost per round: 7.0¢
Total Cost per box/50: $3.50
9mm Luger (CARBINE)
125-gr JHP, 4.7gr powder 1489/lb
Projo: 10.05¢ Primer: 2.0¢ Powder: 0.85¢
Total Cost per round: 12.9¢
Total Cost per box/50: $6.45
.38 Special
158-gr SWC, 3.5gr powder 2000/lb
Projo: 4.35¢ Primer: 2.0¢ Powder: 0.65¢
Total Cost per round: 7.0¢
Total Cost per box/50: $3.50
.357 Magnum
158-gr SWC, 5.1 gr powder 1372/lb
Projo: 4.35¢ Primer: 2.0¢ Powder: 0.95¢
Total Cost per round: 7.3¢
Total Cost per box/50: $3.65
.40 S&W
180-gr TC, 4.7gr powder 1489/lb
Projo: 4.95¢ Primer: 2.0¢ Powder: 0.85¢
Total Cost per round: 7.8¢
Total Cost per box/50: $3.90
.45 ACP
230-gr RN, 4.7gr powder 1489/lb
Projo: 5.45¢ Primer: 2.0¢ Powder: 0.85¢
Total Cost per round: 8.3¢
Total Cost per box/50: $4.15
.45 ACP (INDOOR)
230-gr Plated, 5.1gr powder 1372/lb
Projo: 12.05¢ Primer: 2.0¢ Powder: 0.95¢
Total Cost per round: 15.0¢
Total Cost per box/50: $7.50
.44 Special
240-gr SWC, 4.7gr powder 1489/lb
Projo: 5.45¢ Primer: 2.0¢ Powder: .85¢
Total Cost per round: 8.3¢
Total Cost per box/50: $4.15
.44 Magnum (LITE)
240-gr SWC, 6.3gr powder 1111/lb
Projo: 5.45¢ Primer: 2.0¢ Powder: 1.15¢
Total Cost per round: 8.6¢
Total Cost per box/50: $4.30
.44 Magnum
240-gr SWC, 9.7gr powder 721/lb
Projo: 5.45¢ Primer: 2.0¢ Powder: 1.75¢
Total Cost per round: 9.2¢
Total Cost per box/50: $4.60