If I'm reading this right, you want to go from a 257 AI back to 257 Roberts.
Yes it can, but why. Regular 257 Rbts can be fired in the 257 AI with no problems.
Personally, I'd leave it alone.
You'd have to set back the barrel as mentioned, then re-chambered/headspaced for the Roberts.
My main hunting rifle is a 257 Roberts. I see no reason to convert it to the AI, but if it was a 257 AI I would see no reason to change it back.
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Kraig Stuart
CPT USAR Ret
USAMU Sniper School
Distinguished Rifle Badge 1071
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