I was give an old powder horn awhile back. I decided to get it back in usable condition. The leather was falling apart, butt end needs bees wax ,and the plug needed replaced. The horn had a small amount of old powder, it had drawn moisture. But now that the horn is empty, it rattles because there is something in it. If I shine a light in the spout, I can see what appears to be an old small caliber lead ball. It is to large to come out the spout. Was this put in to help break up clumps when it was made?