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Farmland,
Looks like it discharged either with the gun out of battery (not locked up) -- or partially chambered as you describe it -- or there is insufficient support for the case head. Unless something has changed with the feed ramp, we'll presume there is adequate support for now.
Have you fired lead bullets lately? You might inspect teh chamber mouth where the case is supposed to headspace. If there is a buildup of lead or debris there, it can cause the case go stock before fully chambering.
Obviously, you need to check your powder weights. Could you have accidentally used a small pistol magnum primer?
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