Pic of poor bolt lug contact?

Scottyman

Private
Minuteman
Aug 24, 2008
99
14
Maine
The stock bolt and this custom bolt both show the same contact wear in my Tikka 308. I used a marker to determine if the receiver is good enough to build a 28 Nosler from. Would you build a semi-custom based on this imperfect receiver or are most Tikka receivers similar to this?



lugs.jpg
 

spife7980

Luchador
Minuteman
Feb 10, 2017
9,690
8,545
Central TX
It’s typical that the 9-12 top lug shows more wear than the 3-6 bottom lug does as the bolt sags down with gravity camming on the top more. It’s under firing that it evens out but that doesn’t show much wear as it’s not moving anywhere. That’s why you really should measure it to be sure they are actually even.
 

skl1

"There's got to be a harder way..."
Minuteman
  • Oct 13, 2020
    137
    57
    MD
    Did you have the little screw in spring loaded jig to put tension on the bolt when you did the contact test?

    I'd look for 80% contact on both if I was building something. Pretty simple to true it up, or you could even lap it into 80 percent contact on both sides. If you have a lathe and true it up, you can true up the receiver bolt lug abutments and bolt face too. But obviously then you're adjusting the headspace and "pre-fit" barrels won't headspace right without actually fitting them to the action.
     

    Scottyman

    Private
    Minuteman
    Aug 24, 2008
    99
    14
    Maine
    skl1--I didn't use a jig.
    I just don't know if this looks typical or I should chance it and buy a stripped receiver which may have better contact.
     

    iceng

    Non-Privates
    Minuteman
    Sep 2, 2017
    495
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    Uneven wear is actually (partly) because of the cocking piece forcing the back of the bolt up. It just slightly kicks the bolt.

    Totally normal, nothing to worry about. You have contact, that's more than most savages have.

    Yeah I said it.
     

    skl1

    "There's got to be a harder way..."
    Minuteman
  • Oct 13, 2020
    137
    57
    MD
    I think the contact you're getting is normal/typical for a production gun.