During the Battle of Fredericksburg, Confederate defenders often tore apart the paper cartridges of their Enfields and loaded only half the powder into their rifles because the advancing Yanks were so many and so close.
OK so you're gonna have that many bullets flying at you and you're gonna take time to dump a half a load of powder out when you could possibly take out two or three Yanks with a full load? I don't think so.
Have to agree with the Hawg on that. Sounds a bit too far fetched to me.