Never had a problem with any Remington brass...rifle or handgun...I use Lee, Lyman, and most recently Dillon dies in .45 acp and .45 LC. Sounds to me like you've got a sizing die or inside neck expander plug problem.
One way to check for an under sized neck expander is to try seating the bullet, after resizing only the outside dia. of the case. If it's a tight fit, then your neck expansion plug is at fault. Chucking the plug only in a drill press and using some wet or dry sandpaper on it will reduce it's dia. and still allow enough neck tension, while flaring the case mouth for easy bullet insertion.
The other obvious question is: what dia. are your bullets. If they're less than .451", you've answered your question.
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Last edited by rodfac; December 2, 2012 at 10:44 AM.