Sure, no sweat. Just turn an aluminum or brass plug to fit into an empty case that sticks out the amount you want. Close the bolt on it, open it, remove case, and load the live one. Now good luck finding a rifle throated for breech seating, unless perhaps you have a Weatherby or something that will swallow the bullet without the case touching it. It's fun to play with, I tried it for a while in my .308, but found I could make fixed ammunition that was just as accurate and less hassle.
