Without seeing the rounds and rifle it is hard to say exactly what the problem could be. First, make sure your cases are trimmed to the proper length. Then make a dummy round, and seat a bullet (crimp if you are crimping the bullets).
Several possibilities:
* Cases are too long, forcing the case mouth against the end of the chamber.
* You are not using small base dies and the base of the shell is sticking in the mouth of the chamber.
* You are overcrimping, leaving a small bulge in the neck area, which is binding and not allowing you to extract the round.
* Your die is not adjusted properly, and you are buckling the shoulder of the shell when you crimp, causing the shoulder area to be slightly oversized, binding in the chamber.
* The bullet is seated too far out, engaging the rifling and causing the round to be held in the chamber by interference.
Make a wide stripe down the side of the cartridge with a Sharpie, chamber the round, then look where the mark rubbed off when you extract it.
* If the case is too long, trim your cases.
* If there is a bright area at the case mouth, reduce the crimp.
* If there is a bright area at the head area, switch to small base dies.
* If there is a bright area at the shoulder area, or a micrometer shows a slight bulge, back the crimp die (or seating/crimp die) off.
* If the bullet shows marks from the rifling, seat the bullet deeper.
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