Specifically, .223. I have a bunch I loaded for a rifle that went bye bye, and it had a generous chamber that liked to brass sized on full length dies. My AR is MUCH pickier, (Bear Creek Arsenal barrel), and will choke on FLS brass, MUST be done on a small base die. No, I can't afford to swap barrels right now. Small base dies are RCBS. Now, I haven't looked inside the sizing die yet to see if it would fit, but do you think that with the decapping pin removed, that the sizing die could be used just to outside size the brass without negative effects? Anyone tried anything quite this dumb? If it was just a few rounds I wouldn't bother, ut it's quite a few of them.