On average, RCBS' dies and presses are as good as others of their general type, no better or worse. With any dies, if you have to run cases thru twice to make them chamber you are probably doing something wrong about die adjustment OR press operation.
Suggest you screw the sizer down another 1/16th turn (4.5 thou) and slow your press operation down, keep full pressure on the lever for a couple of seconds.
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