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Message: <blockquote data-quote="Dumpstick" data-source="post: 3596252" data-attributes="member: 41653">I think you are on the right track with neck thickness.  I had that problem with a 91/30: by the time I got a fat enough cast bullet to fill the barrel it would no longer chamber.  The combination of fat bullet and thick brass ran into the chamber specs, and I ended up having to turn the necks of the brass to .010" to get clearance.But not all brands of brass were problematic, some brass brands had thicker neck walls than others.Mic the necks of the loaded rounds, and check the specs.</blockquote>