I'm so new into reloading it's funny. I'm looking to stock up on supplies to stock up on while I save money for a reloading machine. I've got two 5 gallon buckets of 9mm brass from my many trips to the range and now I want to primers. I've been told to get Federal 100 small pistol primers, but with his Godhood celebrating his second term, the 100's are hard to find. Can anyone tell me the difference between the 100's and 200's?