I have 2 SDB's, one for large primer and one for small. I load 4 pistol calibers. I load a leisurely 250+ rounds per hour including filling the primer tubes. I could go faster, but I'm a little anal about it. If I were 40-50 years younger and starting over I'd buy a 650. For 1-2 pistol calibers the SDB works great. FWIW I wear a size 13.5 ring and have enough room in the SDB to make it work.