Brian, rebounding hammers in the hammerless ( internal hammer) guns began use after the first few years of hammerless production. Depending upon your production year, the rebounding mechanism could be at issue.
However, there is another possible cause. Although I like Federal loads, I have found that for reloading I have problems with shell sticking. The cause seems to be softer brass bases in the Federals which expand more than Rems for example. I have also had problems with the primers seating too deep in Fed reloads with the softer brass. A resizing collet may help but my MEC Grabbers do not include them. Because of this for multiple reloads I have gone to Rem STS.
Good luck with your efforts.
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