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?
Pic of poor bolt lug contact?
- Thread starter Scottyman
- Start date
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.
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.
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.
If you have contact at all on both lugs, you are very unlikely to see a measurable performance increase by changing things to have more contact.
I wouldn't sweat it. Not even a little bit.
I wouldn't sweat it. Not even a little bit.
When I lapped lugs on an M1A I split a case and put a spring in it to put back pressure on the bolt lugs. Should work with a bolt gun.
you should bore-scope it now and look for any slight imperfection in the barrel.
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.
Totally normal, nothing to worry about. You have contact, that's more than most savages have.
Yeah I said it.
^^^ Key word right there.^^^
No guarantee and the issue you're trying to resolve isn't an issue.
The point he's making is there are way too many people looking for solutions to problems that don't exist.
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