I had an acquaintance who made little signs like you describe only his were perminant and he attached his to small dowell rods to make little flag-like memory devices which he could place in his bore if he happened to be interrupted while he was loading, swabbing, etc. I have a different memory system. First of all, I have a file mark on my range rod that is level with the muzzle when the gun is loaded. If I am swabbing the bore, I will leave the range rod with the patch on it in the bore. If there is nothing in the bore, it is empty and ready to be loaded. If I have added powder but not yet seated the ball, I leave the funnel of the powder measure sitting in the muzzle. If I have seated the ball and it is ready to shoot, I leave the range rod in the bore. The difference between a loaded gun and one where I am swabbing the bore is that if the loaded mark on the rod is below the muzzle and the rod has a patch on it, I know that I stopped while I was swabbing. If, on the other hand, the rod has nothing on the end and the loaded mark on the rod is even with the muzzle, it is loaded and ready to go. Everyone should have a system so that they can stop in the middle of loading and return and know where they left off. This one is what works for me.