None of the soft solders (silver/tin) are going to be strong enough in the long run. The first sticky case (over pressure or dirty chamber) you get will allow you to rip the bolt handle off of the bolt body. Remington silver brazes their bolt handles onto the bolt bodies, but the surface area is pretty huge compared to Mausers or Springfields. Easiest to do is tig on a new handle, less cleanup. Hardest to learn is to forge a handle.
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