Original 9mm lead truncated bullet
 

Is there anywhere I can find these bullets? I don't cast bullets anymore, so would have to be 'store bought'.

Here is some 124gr'ish Round nose designs

.355, 124, Hornady FMJ/RN ENC 35577
.355, 124, Hornady LRN 10058
.355, 123, Fiocchi LRN TFL
.356, 125, H&N RN F
.356, 125, H&N RN HS
.356, 125, H&N RN HS
.355, 123, Hirtenberger FMJ-RN
.355, 123, Lapua FMJ-RN R381 9016
.356, 123, LOS RN
.355, 124, PMC FMJ Luger
.355, 124, Sellier-Bellot FMJ SB31922
.355, 124, Sellier-Bellot LRN SB31937
.355, 125, Sierra FMJ RN 8120
.355, 130, Sierra FMJ RN 8345
.355, 124, Speer TMJ 3993
.355, 125, Speer TMJ 4362

This will get you started.
If you want to experiment with HP or flat points do some dummys first so you can be sure of proper feeding.

Found what I'm looking for at RMR, Rocky mountain Reloading. 124 grain 9mm truncated cone lead bullet. Cost $18 per 100 plus shipping. I think these are worth a try.

Custom made pistol boxes
 

My latest build

The original "bullets" TC 124gr were not lead, but jacketed.

You know lead bullets are problematic with regard to feeding, but your bullets/ luger may be compatible. Let us know when you get to try them out.

I found some 124gr TC "plastic" coated lead bullets, they work ok; right now I've forgotten the "brand"- but you can probably find them with a web search for coated 9mm bullets. They came in various colors of coating- which would be good if you want to do different loads for different pistols. JMHO.