I use a little White Lithium Grease lube on a Q-tip on about every 10th case. Just a little. Enough sticks to the expander for a few rounds. I think I could probably not use any inside the neck and not notice a difference. I do tumble after sizing. My lube pad is a specially imported from Pakistan, pink cotton textile square, that can be folded, rolled up. HFT Item#46163