What do the primers look like when it is sticky verse when the extraction is fine as it sounds like a typical too hot load
Are they tight to chamber going in? I found issues with the necks on reloads bieng too long and needed trimming but that’s on hand loads not factory.
I think crushing the case neck tip into the rifling was causing crazy pressure
If I was hand loading and found these issues I’d back it off a little on powder charge. And running it over a chrony is good when funny things are happening
Also just cause it’s a Kimber check that the screws holding the action in arnt too long and causing issues as they sometimes come a mil or so too long
Same with the front scope ring screws
Could just be getting hot, expanding and binding.
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