I actually had a kernel of powder lodge between the bullet and neck wall just last week. Surprised the hell out of me, but there is sat right at the case mouth, easy to see and plain as day. Oooops!
Interestingly it was on a 6br case that I use a bushing die to FL size and use a lanolin based lube on the case, so I must have got some on the top of the neck.
Q: Should the neck portion be lubed if using a bushing die?
As for lubing the inside of cases being FL sized with an expander, I do if the case is clean and free of all powder residue. Not doing so risks dragging the shoulder forward and worse, sticking the expander in the neck. I wet tumble after salt bath annealing, so I do size clean cases, however I do not shoot in competition. Those who do probably get all the advice they need at the contest, which is certain to be more applicable to that type of shooting.
Interestingly it was on a 6br case that I use a bushing die to FL size and use a lanolin based lube on the case, so I must have got some on the top of the neck.
Q: Should the neck portion be lubed if using a bushing die?
As for lubing the inside of cases being FL sized with an expander, I do if the case is clean and free of all powder residue. Not doing so risks dragging the shoulder forward and worse, sticking the expander in the neck. I wet tumble after salt bath annealing, so I do size clean cases, however I do not shoot in competition. Those who do probably get all the advice they need at the contest, which is certain to be more applicable to that type of shooting.