Dwight is right on with the 30 Cal. Factory ammo is tough to find & some are underpowered ( Fiocchi brand ) Up here, it's a mess just to find reloading components for it........so far only one bullet available !! ( makes it not so interesting for the reloader...)
Lugers I'm shooting are not collector pistols. I use ``built shooter type guns``...9mm is fun, powerfull but I've more jams with it than the 7.65mm.
My favorite is 30 Cal in spite of the reloading issue. Pistol is shooting 1 1/2 in @ 100 yds.......Ragged hole at 25 yds....That is more than enough for me !! In spite of various testing sessions, I was not able to get that kind of accuracy with the 9mm........
2 important things for shooting: powerfull ammo & good mags.
MARK