I used this drill attachment case length sizer for the first time at 2:30 this morning since I couldn't sleep. I did one and I measured the length and it was dead on. So I locked the calipers into place to use them to check other cases as I went through the batch. Using the drill on low speed it took to the count of ( one thousand one) and it was sized perfectly. Chamfered on the inside and out as well. I checked every second case just to be sure and it cut every case to the same length every single time. I even touched them up on the Hornady Case prep and the chamfers were smooth and perfect. It took about 4 seconds per casing and that's actually adding a little bit for taking one out and putting another in. But I did these cases in record time when I'd still be on there cranking it by hand like an idiot. And yes guys that would be Mr. elite idiot for you! LOL then I swagged the primer pockets and I was done in record time. This is the best thing since sliced bread! Really! Just a quick count on low speed and it did every shell perfectly. All of them were uniform and the same exact length. I think I had a couple of jagged cases come out but then I just put them in there and ran them through slow and it cleaned them right up. This sheds a whole new light on Case prep for me.