With the action open, check to see that the rim of the cartridge will freely slide in the angled grooves. The best way to do that is to hold the cartridge vertically and lean the projectile to the rear so the rim angle matches the groove angle. If it is tight then the plates need to be removed and the inside edges relieved very slightly to increase the gap. When doing such jobs remember that less is more! It is a lot easier to remove metal than put it back!
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