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Bluegunner, i load a lot of semi-autos, mostly AR15, and AR10. Have never had a problem with the .223`s, the match cambers in the AR10`s are another story. If you ever get a live round jammed in the camber, it can get ugly real fast. If i don`t have a small base die for a particular rifle, i check them by carefully chambering each round by hand to see if the bolt closes fully. If you do this with each round before you fire it, things will be fine, if you don`t want to do that, get the small base die and don`t worry about it. Semi-autos are hard on brass anyway, so i never noticed the loss of case life. A 30-06 SB die will work that way, if you don`t mind the extra step.
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