7prc headspace issue?

nmhybridhunter · Oct 28, 2024

Ok so I bought a prefit tikka proof barrel in 7prc. I bought Manson go and no go gauges to just check as I've read some issues online. Well go gauge dropped no issue but so did the no go gauge. Couldn't find a Manson field gauge so I bought a Forster field gauge and bolt will not close. Thinking it's good to go but I was interested in the measurements so got the calipers out and the Forster field gauge says 1.9080 but measures 2.015…the Manson garages don't have any measurements but the no go is 2.036 and the go is 2.032…

All of this just isn't making sense…it doesn't close on the shorter gauge..wondering if maybe I need to order the Forster go and no go and check everything again? Just want to make sure I'm safe out there!

nmhybridhunter · Oct 28, 2024

Also just measured with Hornady comparator using the .420 bushing

Go is 1.890
No go is 1.893
Field is 1.897

cajun · Oct 28, 2024

nmhybridhunter said:
Also just measured with Hornady comparator using the .420 bushing

Go is 1.890
No go is 1.893
Field is 1.897

That's about right. Normally .003-.004 between go/no go.
I would talk to the barrel maker. If you shoot it as is your going to have excessive case stretch most likely.

nmhybridhunter · Oct 28, 2024

My Hornady factory ammo is messing at 1.885..I sent an email to proof just to make sure it sounds ok with them

grouse · Oct 29, 2024

This is a common issue with the tikka. They are good most of the time but not always.

Rflshootr · Oct 29, 2024

How did you tighten the barrel and how tight did you make it?

nmhybridhunter · Oct 29, 2024

I have an inside action wrench for tikka and a short action customs barrel vise…torqued to 100

7prc headspace issue?

nmhybridhunter

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nmhybridhunter

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cajun

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nmhybridhunter

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grouse

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Rflshootr

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nmhybridhunter

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