I called Dillon to get their opinion. They actually recommended using lube on ALL brass - rifle, pistol, all sizes. They said it extends the life of the machine, the dies, and the cases, and it would alleviate this problem. He also said that Starline brass tends to be a little bit thicker than other brass, so that might have something to do with it to.
I asked about using something like a 3-in-1 lube, and the guy recommended against it strongly. I think his main point was that if any gets into the case mouth, it can contaminate your powder and primer. I ordered some Hornady One Shot from Cabelas, so that should fix things nicely.
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