Josh, the easiest way I've ever found and it works everytime is to use toilet paper. Close the bolt. Using a wood dowel small enough to enter the cartridge mouth, push little wads of tp down the barrel tamping tightly until you have enough in for the tamped tp to be about 1/2" above the chamber. Really tamp it at this point. Once you have it as tight as you can get it. Open and lock the bolt to the rear, insert the dowel and smack it with a mallet. If it doesn't work the first time, try to pack it tighter the second. Before you ask, no, I'm not married to Heloise but I did date her for a while. George