I forgot to take any HP ammo to the range but when I got home I tried to manually cycle some and that turned out to be a real problem. Almost all of them nose dived on the feed ramp. I was going to to to the range later in the week and try some but today decide not to wait and waste a trip to the range.
The feed ramp had a bunch of horizontal tool marks so I polished it today and tried to manually cycle some HP's again and they worked fine.
Still going to make a range trip to verify but at least now I'm more confident that all will be well.
I wish I'd thought to take a pic of the tool marks but just didn't think of it in time.
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