Most accurate bullet?
 

Courtesy of Tom Heller's great service, I now have a spare upper receiver with a pristine bore 6in Bohler Stahl barrel..it seems like its really gonna shoot. Have only dabbled with some bulk 115gr FMJs so far...has anyone found that a particular weight or profile really stands out in a Luger? I'm preferring heavier weights 124-125gr and perhaps even 147 (believe it or not, I plan on using this thing for Hunter pistol Sihloutte matches!)

Just about every 9mm will stand out in a luger :)

It is extremly accurate with even the most basic (and cheap) bullet types. Standard ogival and truncated cone bullets should work best.