This is a good topic! I have all the gismos and then some that aren't mentioned here, but I will say probably the best all-around tool I have purchased for my autoloaders is the Sheridan slotted case gages, for example I load for several 308win and 6.5Grr and 223 Wylde rifles, AR or M1a, FNFAL 308win AK plat forms , using these Gages I can size all my brass for any of these rifles back to the spec's so the brass will run out of any of the calibers or rifles without any issues! using only 1 resizing die, and I only size with a Redding body die for everything I size, it doesn't matter what caliber, I get 100% flawless operation, even from brass I pick up off the range, my 2ct