Hey, I found this thread a while back http://thefiringline.com/forums/showthread.php?t=407966
In the bottom it states:
Quote from History of Modern U.S. Military Small Arms Ammunition:
"During the World War I period, the U.S. Navy let at least two contracts for paper bullet blank cartridges to be used in training. One of these in April, 1917, was to Winchester for 1.5 million rounds. These were loaded with tinned cases and white paper bullet. Typical headstamp is W.R.A. CO. 5 17. The other is a Remington contract which was made with a tinned brass case, whitish or yellow paper bullet and R A 17 or 18 headstamp ... 200,000 were delivered."
Obviously it's not a paper bullet, but maybe it could give you some guidance.