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Were you chambering as pictured?
Because that case flare could be interfering with the chambering too.

If you go back to my old post you can see I was suggesting to just crimp enough to get rid of that flare. It will allow you to mess with seating depth and test. If you roll crimp you can seat deeper without ruining the case. If you don’t remove the flare you get a bad reading due to it not chambering.
It could be that you kept dropping the length and chambering a bunch of times which just took a little flare out of the case each time. Eventually letting it chamber.
Based off of case mouth when the seating depth was fine somewhere halfway through your process.

[QUOTE="38ExtraSpecial, post: 9375317, member: 4457"] Were you chambering as pictured? Because that case flare could be interfering with the chambering too. If you go back to my old post you can see I was suggesting to just crimp enough to get rid of that flare. It will allow you to mess with seating depth and test. If you roll crimp you can seat deeper without ruining the case. If you don’t remove the flare you get a bad reading due to it not chambering. It could be that you kept dropping the length and chambering a bunch of times which just took a little flare out of the case each time. Eventually letting it chamber. Based off of case mouth when the seating depth was fine somewhere halfway through your process. [/QUOTE]

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