I just went through this myself when loading for MY new S&W 25-13 Mountain Gun. The Hornady .45 Colt sizing dies--new, current production mind you--are for .454" bullets (WHY!!!???). You need Hornady's .454 Casull sizing die to use .452" bullets. When I called in with this issue they sent me one for free. The fellow I talked to sounded as if I wasn't the first person to have this problem.
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