I have experienced this failure to chamber, occasionally, in my 60 years of hand loading and casting. I recently had this occur with Missouri polymer coated 200 grain Semi-wadcutters in my friends Sig Match 1911. My 945 was fine, but the extra width of the polymer coat prevented chambering in his gun. A Lee FCD will help, and is not expensive, but my Dillon Press does not have the extra step available....what I did find was the BRASS may contribute to the problem...some brass is "thicker" and more robust, hence tighter...by only .001", but a problem. I use R-P brass, have never had a split case in all these years and not a single failure to feed.
I found Winchester to be excellent, but a bit thicker. Federal is also fine. Star-Line is extraordinary brass, but it is also thicker. Match guns may have short leades and tight chambers. My 945 is the most accurate .45acp I have ever owned and the list is VERY long.....some of the also-rans have been converted to hold a Marvel .22lr upper...
I found Winchester to be excellent, but a bit thicker. Federal is also fine. Star-Line is extraordinary brass, but it is also thicker. Match guns may have short leades and tight chambers. My 945 is the most accurate .45acp I have ever owned and the list is VERY long.....some of the also-rans have been converted to hold a Marvel .22lr upper...
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