Then put a dry patch on your jag and push that to the bottom of the breech.
The dry patch goes on your cleaning jag and is fully inserted in the bore. Leave the ramrod (with the jag & patch) fully inserted and pop a cap. Then remove the rod and inspect the patch for powder burn.
Generally speaking, a good load is good forever. But (there's always a but) sometimes as the bore is polished by a lot of shooting you will need to go with a slightly thicker patch.