As Dakota tactical pointed out, the barrel will need to be repressed. When you hit that gap it is too far out of safe range.
The process consist of driving out the barrel pin, pressing the barrel out. Removing the sling eye rivet, heating the triple tree because iijt is suppossed to be sweated to the barrel. Rotate barrel to get a fresh section of barrel for the barrel pin, press the rotated barrel in to achieve correct gap, then reinstall triple tree, etc.
I would recommend reaching out to one of the established smiths and just bite the bullet instead of wasting time. For that rifle to be that far outside the normal operating range you want a professional set of eyes on it.