Thanks to all for the assistance - after cleaning/lubing the sizer and using a better fitting plunger I'm able to get the bullets through without deforming them. However, sizing down .003" does seem to be at the maximum range of possibility since there isn't much left of the grease rings afterward.
Eggman, you make a great point - is anyone making an old style Minie ball that casts somewhere around .573 or even a little smaller? I'm not a competition shooter so I'm more interested in an original style bullet even if it's a little under optimum size.
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