Lyman headspace/case length gauge... I got one for the 223 and one for the 308. I will be getting one for the 3030. They are very handy but... First, resize your brass. Then slide a case into the case gauge; if you have the gauge sitting on a table and you see the case base sticking up out of the gauge, first check the cartridge length. It MAY be too long. But if the case is not too long, check the base diameter across the primer pocket. Check it in a couple directions around the edge. I had 3 bad cases that the gauge said were out of proper headspace measurement. Not so. Before I trimmed a case I tried it in my rifle. It chambered great. But, I got the file out and ran the little bast...file around the rim a few times, until the case settled nicely into the gauge, proving the headspace was not off spec, but the case head rim was too big to fit into the gauge. I checked headstamps and out of 3 2 were WCC and one was LC. Then I had another problem which I remedied post haste. I used Lee water based resize lube on some once fired 223 cases. I did about 15 cases and then the SHTF. I tore two bases off the cases because the lube dried a little too much before I got to the cases. It took a bit of pounding and some prying but I finally got the case out of the die, and then the pin out of the case. Then I reassembled the die, ran the next case through the lee lubed rubber pad and the case did the same thing. Lost 2 like new cases to crappy lube. The 2 tubes I got last year and am finally getting around to trying now reside in the trash can next to all the large rifle primer debris. The 2 brass cases were given honorable disposal in with the lead slag and other tossed away cases. I do not know if they will ever make it to the scrap yard but they are now out of my hair. I cleaned off the pad with goop and rinsed it good with hot water. It dries fast being non porous. I applied some RCBS goose grease on to the pad and did a few more 223s w/o any problems. Now it is time for a lot of coffee, Netflix and wait for the mail delivery person, henceforth to be called "mailman" because I am not PC and am proud of it, who will at her earliest convenience, not mine shower with me...I mean shower me with hundreds of 223 and 308 cases, and if the UPS guy makes it through the cold and snowless wilderness of eastern Iowa, a few hundred more once fired 3030 cases. I don't know what I will do with all of them. I am almost out of primers.