Thanks everyone for the help, I got it figured out. Dean2 had it right when he mentioned the seating die screwed down too far and the crimp part pushing on the neck, causing the shoulder to deform.
My brass was trimmed to the correct length, 2.090 when 2.100 is max. The seating die was screwed down just a bit far. When I reset that, the bullets seated much nicer and didn't deform the brass. Interestingly, after i seated the bullets the first time the shoulder was pushed back about .005 further then they were after I full length resized.... meaning that likely the crimp part of the die put excess pressure on the neck, as my bullets don't have a crimp ring, which pushed the shoulder back, and then deformed part of it, as shown in the picture above.
Not sure howhat my die got moved, but oh well, at least it makes sense!
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