carbine85
Member
Assuming the head space is too tight, what is the proper way to achieve head space clearance?
Head Spacing a Mosin Nagant
- Thread starter carbine85
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Gunnerboy
Member
clean out your chamber with a bore brush and drill with hoppes #9 and try checking the headspace again
OP
OP
carbine85
Member
How would a Russian armory correct the head space on a newly built or re-barreled rifle? Cleaning isn't an issue in this case.
Jim Watson
Member
They could make a small change by swapping bolt heads but a rebarrel with tight headspace would be easily corrected by an armorer with a reamer.
TurtlePhish
Member
If you're worried about getting one with too-small headspace, don't worry. 99% of them are rearsenaled and all parts are in a fully-functional state. If you have one with a tight chamber, buy a new bolt head and see how headspace is.
16in50calNavalRifle
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Have you actually determined there is a headspace problem (in this case, a "go" guage not fitting, for "too tight")?
You can get M-N headspace guages at okiegauges.com - I have a "no go" only and think that is sufficient for these re-arsenaled M-Ns. The plunk/fit of a cartridge in the chamber, as directly observed, is my "go" guage.
You can get M-N headspace guages at okiegauges.com - I have a "no go" only and think that is sufficient for these re-arsenaled M-Ns. The plunk/fit of a cartridge in the chamber, as directly observed, is my "go" guage.
caribou
Member
Alot of rearsenal'd Mosins have cosmoline dryed in their chambers, and the fit feels like tight headspace. Its hard to see the stuff, as it shines and is what is constricting the chamber but a drill, 20 gauge brusha nd carb cleaner will get it out.
When thers cosmo in a recently uncrated Mosin chamber, it makes for a tight chamber, often leading one to think the headspace is too tight. That cosmo has been there for 60+ years, and can be hard to remove. They did that , because if the chamber is bad, its useless.
Otherwise, a reaselnal'd Mosin will be in spec, and inspected and given one of a myrid of inspection marks, this included test fireing and head space adjustments BEFORE it was accepted, preserved and crated for WWIII
In an armoie, a chamber reamer would have done the job if swapping bolt heads didnt fix the problem.
Its a rimmed cartridge and head space issues are settled on the thickness of the rim, not the shoulders length, and a bolt head swap can make that adjustment.
When thers cosmo in a recently uncrated Mosin chamber, it makes for a tight chamber, often leading one to think the headspace is too tight. That cosmo has been there for 60+ years, and can be hard to remove. They did that , because if the chamber is bad, its useless.
Otherwise, a reaselnal'd Mosin will be in spec, and inspected and given one of a myrid of inspection marks, this included test fireing and head space adjustments BEFORE it was accepted, preserved and crated for WWIII
In an armoie, a chamber reamer would have done the job if swapping bolt heads didnt fix the problem.
Its a rimmed cartridge and head space issues are settled on the thickness of the rim, not the shoulders length, and a bolt head swap can make that adjustment.
Found this on another site, can't vouch for it, but seems similar to what I found before I constructed my own headspace gage (from a washer)
Now as to gage measurements and that dime.
.065 go gage
.071 no-go gage
.076 field gage
(dime does NOT work)
Now as to gage measurements and that dime.
.065 go gage
.071 no-go gage
.076 field gage
(dime does NOT work)
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