I have aquired old Stevens 37 Ranger .410 shotgun, which has excessive headspace. The fired case head actually has a bulge in front of the rim. I have not fired this shotgun since I became aware of this unsafe condition. I built up the rear of the case with tape until the bolt would close with some effort. I then measured the tape thickness, and it was .045. Is TIG welding up the bolt handle, moving it forward to compensate, a proper way to correct this condition? I don't know whether the bolt, the handle, or the cut of the chamber, is the root of this problem. Any input on correcting this problem?