Here are costs from a reloader's perspective.
9mm 115gr RN coated bullets, 750 @ $73.14 = ¢9.8 per bullet
9mm 147gr FP coated bullets, 750 @ $85.13 = ¢11.4 per bullet
45ACP 230gr RN coated bullets, 650 @ $102.59 = ¢15.8 per bullet
That is 61% more for the 45 ACP compared to 115gr 9mm.
[URL unfurl="true"]https://thebluebullets.com/[/URL]
For copper jacketed plated bullets, Zero Bullets:
9mm 115gr FMJ RN, 500 @ 61.99 = ¢12.4 per bullet
9mm 147gr FMJ RN, 500 @ 66.99 = ¢13.4 per bullet
45 ACP 230gr FMJ RN, 500 @ 85.99 = ¢17.2 per bullet
That is 39% more for the 45 ACP compared to 115gr 9mm
[URL unfurl="true"]https://www.powdervalley.com/product-category/reloading-supplies/reloading-components/bullets/filters/brand/376/[/URL]