The standard Remington 115 grain hollowpoints generally feed pretty well in older pistols designed for ball. Some pistols will feed anything so you have to try different loads. The Federal 115 grain HP 9BP also will probably work.
Generally speaking, Lugers are very tempermental about feeding anything other than hardball ammo. As ironhead says, the standard Remington 115 gr. HP, which is shaped very much like a ball load, is the first one to try.
Another good choice would be the Federal EFMJ (Expanding Full Metal Jacket) load, that is an fmj with a polymer ball in the nose that splits the jacket on impact and allows the bullet to expand like a HP.
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