I've fired dozens of different JHP's, solid copper, etc out of my G date. All functioned flawlessly. Obviously when the gun is getting dirty it starts to have problems, but clean fires everything and anything.
I've found a round that duplicated the original 92gr Sintered Iron WWII Wehrmacht load. It's a solid copper expanding monoblock, 92gr by Fiocchi that will feed reliably in even a dirty luger due to it's profile. It's chrono'd 1271fps out of P08 and 1694fps out of MP40.
http://www.midwayusa.com/product/249...lock-box-of-50