When do you chamfer and deburr? I'm open to any change in technique that will save time and effort. At present, with the Lee set-up I chuck the shell holder into the drill, cut the case back, then while the case is still thus, I chamfer and deburr with the little rocket ship-shaped tool, I don't have a 3 way.The trick IS to chuck up the cutter and feed the case onto it, as opposed to what Lee says which is to feed the CUTTER onto the chucked up case.
I've found the Lee set-up used with a cordless drill to be relatively quick, definitely cost effective. For years, I had a Hornady (old Pacific legacy style) trimming tool. Hand crank, it took some time to use.
One tip, get the case rotating before you insert the cutter/mandrel.
I also have the World's Cheapest Trimmers for .223 Rem. and .308 Win. They cost about $20 each, very fast to use. You have to watch and make sure they don't get out of adjustment, you can wind up with many over-trimmed cases in a hurry. The WCT trims only, you have to come around again for the deburring /chamfering.