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I can only think it is because Kimbers are known to have tight chambers. My 280AI won't chamber well with brand new brass unless it is FL sized (using Redding 0.020 comp shell holder).

Yes I trim my front scope screws...a bit of the wife's or MSL's lipstick on the bottom of the front mount screw will let you see if there is contact. I think if was carbon it would do it every shot....

That's a different one. Kimbers seem to have very tight chambers...even new brass can be tight in mine. I think it sounds like a very minimal change in chamber dimensions after the heat of the first...