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Number 4 Mk2 Headspace

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doggo View Drop Down
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    Posted: September 23 2021 at 1:08am
How tight can a head space be, can the bolt close tight on the rim with no space between rim face and bolt face and be safe to fire or do i need a gap between rim face and bolt face  (the rim thickness is all the same measurements and new barrel)
Cheers Gary
EGB
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Zed View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Zed Quote  Post ReplyReply Direct Link To This Post Posted: September 23 2021 at 12:38pm
The bolt should close on the 0.064" gauge. 
Headspace for a new barrel would be set at around 0.067"
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Shamu Quote  Post ReplyReply Direct Link To This Post Posted: September 23 2021 at 4:20pm
As long as it will close fully & lock on an 0.064"  GO gauge (measures the minimum acceptable headspace. This size is most often used when re-barreling or re-chambering a firearm.)
It's good.
Don't shoot till you see the whites of their thighs. (Unofficial motto of the Royal Air Force)
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Post Options Post Options   Thanks (0) Thanks(0)   Quote britrifles Quote  Post ReplyReply Direct Link To This Post Posted: September 23 2021 at 6:04pm
I like to set headspace such that the bolt just fully locks with very light finger pressure on the GO gage.  Minimizes brass stretching. And, most rims measure a few thou under 0.064, commercial brass will have even thinner rims. 
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Post Options Post Options   Thanks (0) Thanks(0)   Quote doggo Quote  Post ReplyReply Direct Link To This Post Posted: September 23 2021 at 10:42pm
Thanks for the reply's
My bolt will close on 0.062 inch with slight one finger pressure for the last quarter inch of bolt travel to lock up ( there is no gap between bolt face and 0.062 gauge  there is a slight gap 0.002 inch on PPU case rims which measure 0.060 inch and bolt closes very easy on them 
My Rifle is No 4 mk2 with a new (un fired) sportco barrel with a tight chamber set up as a sporter 
Main question do i need a gap between bolt face and rim face to fire it safely ( making sure all my case rims are the same measurements eg if case rims measured 0.062 inch 
also have a No 4 Mk2 full wood with new Lothar Walther barrel on it  shooting 1 MOA if the nut behind the butt is on I have had this rifle since i was about 14 yrs shooting it at Trentham Range and have gone through a number of barrels on it 
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Shamu Quote  Post ReplyReply Direct Link To This Post Posted: September 24 2021 at 9:32am
Not really. The range between GO & Field is the acceptable tolerance so anything in there is good.
A little is good because the action & bolt heat up during long strings so there is some expansion of the metal.

Don't shoot till you see the whites of their thighs. (Unofficial motto of the Royal Air Force)
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Post Options Post Options   Thanks (0) Thanks(0)   Quote britrifles Quote  Post ReplyReply Direct Link To This Post Posted: September 24 2021 at 2:08pm
doggo, sounds like headspace on your rifle may be slightly less than GO gage. As long as the rim thickness is less than headspace, no issues at all.  Just watch for the possibility of an occasional thick rim and resistance to close the bolt, that puts additional load on the locking lugs.  Add to that an oily or wet chamber, and you have potential to overly strain the action.  




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Post Options Post Options   Thanks (0) Thanks(0)   Quote doggo Quote  Post ReplyReply Direct Link To This Post Posted: September 24 2021 at 9:47pm
Thank you all for your replies Doggo
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Post Options Post Options   Thanks (0) Thanks(0)   Quote muddyboots Quote  Post ReplyReply Direct Link To This Post Posted: October 01 2021 at 4:39am
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Originally posted by Zed Zed wrote:

The bolt should close on the 0.064" gauge. 
Headspace for a new barrel would be set at around 0.067"
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