The crimp setting on your dies is what is causing this, no two ways about it. You have it set way wrong.
First off, you don't need a crimp, spin the seating die up, run a case to top of stroke, screw seating die down till it contacts the case mouth, back die out 1/2 turn. Use seater stem to adjust seating depth of bullet.
If you must have a crimp for some reason get a Lee crimp die and do it as a final step. If you want to use the Hornady die, you must have every case trimmed to EXACTLY the same length. Do above procedure, screw die down till it stops on the case mouth. set seating stem so bullet seats 1/100th longer than final, now lift the ram to move the case with seated bullet out of the way and turn the die down 1/8 of a turn. Run case with seated bullet back into the die and check how much crimp you get and COAL, go down a 1/16th turn at a time till you get the right amount of crimp. Do final COAL setting, longer or shorter with seater stem.
Yes you can resize those and reuse them with no problem.
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