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Owned a 550B for many years. You clean your brass first with the progressive.
I use RCBS lube and a lube pad. I roll the case on the pad with light lube first then pick the case up and stick it mouth down and rotate it while pressing down. That simple act leaves a little lube just inside the neck's mouth. I use a good bit of 2230 powder, very fine grained, and have no issues with clogging from excessive lube. I reload for three AR guns and a Mini-14. I usually wipe down the AR's ammo with a dry rag after it is loaded to make sure there is nothing on the outside of the neck/shoulder area. The Mini is a "if it fits, it shoots" gun, way more forgiving of a grain of powder or two.
I usually wipe the necks as I put the loaded ammo in the MTM boxes.
Ed
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