Jaa Posted 13 September 2008 Share Posted 13 September 2008 (edited) Boxed Set of .22 head space gauges. **** Sold **** Edited 24 September 2008 by Jaa Link to comment Share on other sites More sharing options...
Guest yardman9 Posted 15 September 2008 Share Posted 15 September 2008 Please will you state the range of sizes of these gauges. Thank you. JC Link to comment Share on other sites More sharing options...
Jaa Posted 15 September 2008 Author Share Posted 15 September 2008 Please will you state the range of sizes of these gauges. Thank you. JC Engineered by Barry Neson, we all know how good he is. 1. Size .0395 2. "" .0405 3. "" .0415 4. "" .0425 5. "" .0435 6 "" .0445 7. "" .0455 Link to comment Share on other sites More sharing options...
David Posted 22 September 2008 Share Posted 22 September 2008 How do you use them? Start with No. 1 and work your way through then until you cannot shut the bolt? Link to comment Share on other sites More sharing options...
treetop Posted 22 September 2008 Share Posted 22 September 2008 ok.... so whats / hows that going to help / do?? sorry if thats a dumb question.......but it you dont ask....you never will find out!!! Link to comment Share on other sites More sharing options...
Guest Jus Posted 22 September 2008 Share Posted 22 September 2008 Measuring headspace...... http://www.surplusrifle.com/shooting/headspace/index.asp Link to comment Share on other sites More sharing options...
lincs-alan Posted 22 September 2008 Share Posted 22 September 2008 The head space is the distance from the face of the bolt to the chamber, if it's too large when you close the bolt on the case it will leave room to move when fired, this can have all sorts of issues with consistant accuracy. thats the simple 'im only a sparky" version I'm sure someone can give you far more details if you wish Alan Link to comment Share on other sites More sharing options...
Guest Posted 22 September 2008 Share Posted 22 September 2008 So how do you know when the headspace is too much. And what does one do about it??? Link to comment Share on other sites More sharing options...
treetop Posted 22 September 2008 Share Posted 22 September 2008 that's what I was kinda getting at Kevin..... how do you know what's correct??? thanks Link to comment Share on other sites More sharing options...
batty Posted 22 September 2008 Share Posted 22 September 2008 you correct using shims (again barry sells these) Link to comment Share on other sites More sharing options...
tenpointnine Posted 22 September 2008 Share Posted 22 September 2008 Bill Calfee, one of the USA's leading Benchrest gunsmiths sets headspace between 42 thou and 44 thou. If the headspace is too great it can cause inconsistent ignition, leading to loss of accuracy. By inconsistent ignition I am not referring to misfires. As you know, the priming compound in the rim of the case ignites when struck by the firing pin. If 1 cartridge is up against the breech face when the pin strikes, the resultant ignition will be different to a case which is up against the face of the bolt, and the firing pin pushes the case forward 2 or 3 thou before coming to a stop at the breech face, and THEN igniting. It is this inconsitent ignition which causes loss of accuracy. What can you do about it? Well, later model Anschutz (from the later 16 series with swept back bolt, to 18, 19 &20 series) can have a thin shim or shims fitted. These shims are available from guess who, that's right, Barry Nesom. (50p?) Earlier 16 and 14 models have a plunger on the bolt handle which mates with a notch in the bolt body, and this chews the shims up in no time. I believe the 20 series would have the headspace set by moving the barel in the action, which of course is clamped, not pinned. It is also possible to get a new bolt handle from Anschutz (which must be sent to an RFD, as it is effectively classed as a firearm). I did this with Claire's 1607 in 2002, and it was sent to Ian Gibb who stoned it to the correct headspace. Another method which I have observed in the Anschutz tent at Bisley, is to take the bolt apart and using a small hammer, tap the bolt around it's circumference at the point where the bolt handle butts up against it. This might be ok for an Anschutz technician, but I wouldn't recommend it for the rest of us! Not sure about Walthers or other makes. Hope this helps. Walter Link to comment Share on other sites More sharing options...
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