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No1MkIII Bolt head size?

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    Posted: July 11 2018 at 1:57pm
Ah I see, thank you!
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Shamu Quote  Post ReplyReply Direct Link To This Post Posted: July 11 2018 at 12:52pm
Its an old method of removing the striker. There was a matching lug on the striker. They frequently refuse to screw in fully to newer bolt bodies.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Canuck Quote  Post ReplyReply Direct Link To This Post Posted: July 11 2018 at 10:28am
Why do some #1 bolt heads have a slot cut in the threaded section?
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Post Options Post Options   Thanks (1) Thanks(1)   Quote Shamu Quote  Post ReplyReply Direct Link To This Post Posted: December 10 2015 at 4:08pm
Unless you use neck sizing dies & adjust them via a smudge.
They will slowly move anyway so that after many firings you'll need to do at least a "partial full length resize" to get everything back in place.
That's why I prefer the partial full length tuned to the individual chamber over neck sizing, because of consistency.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote evanguy Quote  Post ReplyReply Direct Link To This Post Posted: December 10 2015 at 12:34pm
Gun nut 4. I also shoot 43 mauser and use bertram cases. so it is rimed and that why i brought it up

Shamu, i believe its off the sholder because the rim  no longer touches the barrel and is only used for extraction at that point. and moving the sholder in a sizing die will adjust head space
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Zed Quote  Post ReplyReply Direct Link To This Post Posted: December 10 2015 at 11:56am
The fact is that with a Lee Enfield, if it won't get proper headspace with a good bolt body and the largest standard bolt head; then the receiver is worn out. With the only exception maybe if someone has been at the chamber with a reamer.
I now have a new bolt body to try with a couple of bolt heads. So we will see if it can be improved. 
However I must say that at present the rifle is still safe to fire, as it does just pass on the field gauge, it was UK Proofed in 2013 and my reloads are slower than standard, because this rifle is more accurate at around 2200 ft/second.
I'm just interested in trying to get this rifle as accurate as I can and I think this is one area that could be improved.

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Post Options Post Options   Thanks (0) Thanks(0)   Quote Shamu Quote  Post ReplyReply Direct Link To This Post Posted: December 10 2015 at 11:21am
There is a school of thought for the .303 that uses some kind of "o-ring" or rubber band to force the virgin case base back against the bolt face & then fire a forming charge to blow the lubricated case out to match the chamber at which point you just neck resize.

I honestly don't regard it as actually "head spacing off the shoulder" so much as fire forming to the individual chamber though.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Gun Nut 4 Quote  Post ReplyReply Direct Link To This Post Posted: December 10 2015 at 7:22am
Head spacing off the shoulder, instead of the rim, would probably work for a Mauser because most Mausers shoot a rimless cartridge case, and relies upon the shoulders to hold the cartridge in place when chambered. The .303 British cartridge is rimmed and relies upon the rim to hold the cartridge in place. There are a few Mausers that do fire rimmed ammunition, and the head space between the bolt face comes into play. I shoot a 43 Mauser in which I use 45-70 brass, the rim on the 43 Mauser is thicker than on the 45-70 so primers sometime push back out of the primer pocket about a .001" 
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Post Options Post Options   Thanks (0) Thanks(0)   Quote evanguy Quote  Post ReplyReply Direct Link To This Post Posted: December 10 2015 at 2:43am
Well i know your trying to fix your rifle properly. but there is always the option of head spacing off the sholder instead of the rim.

My mauser has 0.040 head space wih the rim THERE lol. so i have to either seat my cast bullet out far enough to hit the rifling, in return holding the rim back against the bolt face witch fire forms the sholder to its new location. now they head space off the sholder and are tight when i close my bolt.

A better option may be to use rubber orings on the base of the case before the rim to hold them out to you bolt face until the sholder is moved.

But hopefully you are able to find a longer bolt head or maybe try anothr bolt. there are a few options none are as ideal of the propper size bolt head.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Gun Nut 4 Quote  Post ReplyReply Direct Link To This Post Posted: December 09 2015 at 2:42pm
To my knowledge the Mk III only has one length of bolt-head. It maybe the gun was re-barreled at one point, and the new barrel was't set deep enough. Are you experiencing any blow back? You can sometime compensate for the difference in head space by not running the brass as deep into the sizing die, you may of course have to readjust the depth of your primer punch. 
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Zed Quote  Post ReplyReply Direct Link To This Post Posted: December 09 2015 at 4:12am
I have seperate ammo for my No1MkIII* and my No4 Mk1/2 rifles. The head space on the No1 is very close to the limit of the field gauge which is 74 thou, fails the armourers No-Go which is 70 thou.
I just want to try and get it back to the 70 thou mark. I suspect it's probably around 72 or 73 thou at present. I am using the OKIE gauges instead of my old DIY method, and it's proved a worthwhile investment because I was close but not really accurate enough with the DIY system.


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Post Options Post Options   Thanks (0) Thanks(0)   Quote Gun Nut 4 Quote  Post ReplyReply Direct Link To This Post Posted: December 08 2015 at 1:36pm
Are you having a problem with head spacing on a Mark III? I have a number of them and haven't encountered any problem. Bolts are pretty much interchangeable between rifles. It's the No. 4 Mark I, that they got creative with. If your reloading ammunition shot in the No.4 Mark I, and using it in the Mark III you could possibly encounter a case head separation. The problem is the head space in the No.4 Mark I, it was fired in. You have to watch the area just ahead of the case head for signs of thinning from sizing and resizing, especially if its been fired in a No.4 Mark I. The older Mark III had looser chamber. This allow the British to use thinner walled brass. When the Canadians attempt to fire the British brass in the Canadian made Ross rifles, it expanded such that it would  jam in the chamber. So if you have had a case of head separation in a Mark III it the larger chamber allowing a weaken area of  an over used  case to over expand. 
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Zed Quote  Post ReplyReply Direct Link To This Post Posted: December 07 2015 at 11:23pm
OK thanks Shamu. I'll check the ones I've got. Should have a new bolt body coming as well so hopefully I can make some improvements. I'll be carefully re-reading Mr Laidler's article on fitting bolts!

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Post Options Post Options   Thanks (0) Thanks(0)   Quote Shamu Quote  Post ReplyReply Direct Link To This Post Posted: December 07 2015 at 3:12pm
OK, I still can't find a length for you, but all is not lost.
A new, unfitted (& so longest) head has an "S" stamped in it  I think on the front face of the extractor lug. Not sure how much that helps but at least you know you're looking for an "S" stamped bolt head.

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Post Options Post Options   Thanks (0) Thanks(0)   Quote evanguy Quote  Post ReplyReply Direct Link To This Post Posted: December 04 2015 at 8:16am
Wow, harder then i thought. i tested the bolt face on two bolt heads they were 51rc and 48rc. the 48rc was a pitted bolt head the 51rc was near perfect condition. now i have small dents in them haha oh well. it was worth it.


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Post Options Post Options   Thanks (0) Thanks(0)   Quote Shamu Quote  Post ReplyReply Direct Link To This Post Posted: December 04 2015 at 5:02am
"So if my replacement bolt head is unused and unfitted; I suppose that it is the longest available. I would like to confirm what is the maximum length to be sure."
That should be correct.
Surprisingly I have had  a hard time finding the measurement. I'm still looking though.
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