Yes I've seen several other photos of extreme examples like this which leads me to believe my quest may still be possible.Long time ago I farted around making this beauty.
I don't recall exactly what dies I used, but started with a fired 30-06 case and my 7BR form die, which initially pushed the should back to BR length. Then I used several more does to get it eventually to 22 caliber. This was way before Remington offered factory 7BR brass & you had to use the full length 308 BR brass to form to shoot in the new X-P-100's in 7 BR.
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However 4-5 thousand cranks on the press has me weary just thinking about it.