i use lee tumble lube bullets, and run every one thru a lee sizer.I use a 6 cavity mold, and find that ever so often you get oversized bullets, either from not gripping the mold handles the same every time or what not.doesn't take a lot of time, and the good bullets just run thru with little pressure, but you'll find a few that are tight! a few got by me last night casting, and would not go thru the sizer,and had to drive them back out.the lee sizer is very inexpensive and is a cheap way to keep problem bullets culled out.