Help-Advise on shooting a SC 6-43 barrel that has been modified

[tomwatts]

I just acquired a SC 6-43 on flie-bay, and I thougt the picture here showed a SC with a barrel shim, so I bought it anyway. (SC barrels are hard to come by!)

Turns out that's no shim, the shoulder has been cut back leaving a sliver of the shoulder in place. The barrel mounts fine and indexes snug with good head space.

Attachment 30282
My questions are:
1. Is this barrel safe to shoot?
2. If its not safe to shoot, can it be saved, by a gunsmith with the proper tools?

Thanks is advance for any advise!

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