I went thru this earlier this year.
You only have a couple of factory options: very old & expensive Kynoch or very new & expensive European sourced.
Reloading is a better option, but bullet availability runs from real common to you kinda have to fudge up your own.
You 100%, absolutely NEED to slug your bore, for one thing. 9mm is nominally .354", however your barrel may slug anywhere from that up to .358"!
If it's anything under .357, you're going to need a swaging dies, or set of them too take .358 bullets down in size. Reloading data is scarce & varies wildly! Brass can be formed from either 8x57 (cheap but doesn't last) or 9.3x57 (better life, but more spendy)
I have data that i'm happy to share, but with iron sights, you'll need to load to your sights, rather than a max velocity & my data is unlikely going to work for you, but it'll give you a start.
