Hornet cases are very thin and not as forgiving as others. Need to see your dent/cracks as normally they are the opposite of each other. A dent or bulge is caused by something pushing on something else, commonly lube buildup in the die or an unchamfered mouth pushed back by the bullet during seating. Cracks are almost always caused by excessive case stretching or being pulled causing case thinness.
Feeding issues usually aren't caused by reloading, the magazine is usually the culprit. Do factory loads feed and chamber? Reloading mistakes may cause difficulty chambering but not usually feeding.
Are your cases trimmed to SAAMI specs, if not the case mouth can contact the chamber? Are you chamfering the case mouth after trimming and even if you haven't trimmed yet, if not seating a bullet may push the neck back? Are you adequately lubing the inside of the neck so as not to be pulling the neck during resizing?
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