I notice that I get small amount of powder just inside of the neck. It's sticking to the lube. I use a lube pad and twist the necks on the pad to lube.
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I have loaded .308, 243, 6.5 Creedmoor, .223, and 300WM and never lubed the inside of the necks of any of them.
If you want to lube the necks you can use a dry neck lube like "Imperial Dry Neck Lube". Works well and doesn't contaminate powder.