Are you sure there is a live round under the lodged bullet?

What loads are in the chamber? How much space between the end of the loaded cartridge and the front face of the cylinder?

If this revolver was brought to me when I was an armorer, I would be considering inserting a block between the firing pin and the primer of the round forward of the firing pin. I would then lock the revolver in a vise and use a range rod to tap the bullet back into the cylinder. Judging from the rod indicator in the OP’s photograph, it does not have to be moved much to free the cylinder.

Kevin

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