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Some of the older HPs are like that as they have the "humped" feed ramp; the newer MkIIs and IIIs do not an feed about anything. Vary the loa, but do not seat very much deeper without reducing your powder charge. Sometimes, odd as it seems, seating deeper works better than longer, although "longer" ususally is the way to go. As the previous post mentioned, I'd be quite suspect of the magazines as well. Best.
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