Greetings all! Havn issues with sizing...I'm full length sizing 22-250, several times fired Win brass, with a fl sizer rcbs die and the lee challenger press and I'm havn a peculiar problem. Some of the resized cases are really resistant, and some won't allow me to close the bolt, "its a bolt action rifle" some others no prob. Checking the case length on those that won't close, I found those to be quite under max length, what gives? All of this is checked before I prime so cases have been checked for or trimmed and bullet depth is not a factor. Now, I just got this kit not too long ago, I've reloaded before several times at my buddies using all rcbs equip with no sizing issues whatsoever, so I gotta a little handle on reloading but certainly no journeymen like others. I've reloaded three batches of 30 rounds it was the first batch that had actual finished rounds that would not feed. Went back, gave the sizer die a little turn down...checked for feed, no problems 2nd batch...all fed and shot well, a little resistance on some but pretty good. Now the third batch and the problem has reemerged. I know I could go out and get a gauge or something, but I haven't changed a thing from all the data I kept from reloading at my buds..headspace not so much attention to just as long as it fed was all I cared, bullet depth was where we spent our time resulting in a beloved load with no chambering issues at all. He suggests I upgrade to a different press, he being an rcbs fanatic, or some new brass, any other thoughts would be extremely appreciated.