I purchased a 6mm rem rifle awhile back and just getting around to messing with it. My friend that built it has passed away so I have no reference. He sold me the rifle and about 200 rds of Norma brass with a set of old lyman AA deluxe 6mm dies. When I went to size the stuff I can only run about 4 or 5 thru b/4 the expander plug gets so tite I am afraid to try another one. If I take the expander plug out and clean it I can do another 4 or 5. I had some Hornady brass on hand so I tried that, I could run about 10 thru b/4 it started seizing up. I tried a little case lube on the case mouth and then on the expander plug and this only seemed to make it worse. I removed the expander stem from the die and tried running the brass thru without it and they worked just fine. I then got my rcbs 243 dies out, screwed the expander plug waaaaay down and deprimed and expanded then sized them with the lyman die. This seemed to work ok. So I am trying to figure out if the problem is the Norma brass or the lyman dies. Best as I can measure the expander plug in the lyman is same as the plug in the rcbs, although the lyman plug is a big long 1 and the rcbs is just a little short 1. I hate to chuck the dies or the brass, I always heard Norma brass was top notch stuff and they do not make it in 6mm Rem any more. What do you all think, is the brass or the dies??