When the "problem" was discovered there was a lot of hype over it. The receivers were assumed to be soft as well when, in fact, they are forged just like the USGI makes. Companies like Smith were advertising their services to harden the receivers and the bolts or to replace the bolts. Soon the news came out that the receivers they over hardened were now considered to be brittle.
As far as the soft bolts go, what I read was over time and a lot of shooting the lugs would wear and affect headspace but it was only after many shots, more than many of us will ever shoot. Type and amount of lube would affect their life too.
Good you changed the bolt though. Now you don't have to be concerned over shooting it and whoever it goes to after your time here.
They're good guns made from Winchester tooling and U.S. blueprints. That's why bush (H) and clinton put a ban on them instead of banning Chinese made underwear, shoes with glued on plastic soles and other un-needed BS like rubber dog crap.
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