Re: bottleneck rifle cartridges neck lube: You can use a dry lube to dip the neck into after spraying (or rolling) the outside of the case with lube. I hesitant to use a wet lube inside the neck. After I saw sticks of powder sticking to the inside of the neck just before seating the bullet, I decided to eliminate the potential problem of contaminating the powder with spray lube on the inside of the case neck. It's not supposed to be there.
I've never tried to experiment and determine what effect the wet lube would have on a powder's ignitability, or a primer's for that matter, but clean and dry means clean and dry. The first part of the powder drop takes any case lube residue on the inside of the neck right straight to the bottom of the case where the primer is sitting, mouth wide open.
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