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jcoyoung... A few points.
First, is the case length under minimum?
Second, it is a good idea to size new brass. The brass can get banged up a bit in the neck area and insertion of a bullet may or may not make it sufficiently round to chamber easily if the brass is near maximum and the chamber near minimum.
Third, when you size the brass lube (very, very lightly) the inside of the case necks. If you don't do this sometimes the shoulder of the brass can be stretched as the expander is withdrawn from the case.
Fourth, are there any marks on the bullets from the lands of the barrel? Throat dimensions do vary- usually not this much- but it is possible as factory barrels use a seperate throating reamer.
Fifth, have the die checked.
Sixth check the chamber.
Seventh, when you trimmed the cases did you deburr? If you did, how good a job did the deburring tool do?
Good luck, Bob
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