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I was always under the impression that crimping for auto loaders was to keep the bullet from being pushed into the neck as it strikes the feed ramp and/or barrel extension lugs.....before I smoothed out the ramp/barrel extension lugs on my SSK AR I got deep scratches in the bullet and gouges in the neck of the brass in everything from 125's to 220's....I test slam chambered several hundred different rounds checking for marks on the bullet/brass and measuring overall length at the ogive, never had one round move in or out.....
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