I generally use Lee dies with few problems. However, my 86 dated Lee .30/'06 die wouldn't resize two commercial '06's quite enough to chamber, a Ruger 77, and an FN Mauser, (both factory). I had to use an RCBS FL die to get ammo which would fit in them. I have a .308 Enfield rebarrelled by Ron Smith with a tight chamber which won't accept cases from a Lee die, but that's a custom chamber. I love the Lee collet resizing dies for cases which have been fired in the rifle in question. As long as the necks are clean, I don't bother lubing them.