On that type of ML removing the nipple and breech plug with the tool that hopefully came with the rifle is part of the normal cleaning process that you should do after each shooting session. So if you have the instructions follow them or have someone who knows show you how. This is needed to clean the threads, and put more thread grease on the threads. (powder residue will get back into the threads). With the breech plug removed you can just push the load out the back. Also cleaning can be better acompliched. They sell brush kits for cleaning the threads in the barrel and on the breech plug, pluss the whole through the center where the nipple goes.