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03-18-2010, 10:06 AM
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For what type of steel is the min .025 is this for damacus and fluid both as well as stub and twist I am wondering.
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03-18-2010, 10:28 AM
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Dam and fluid
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the same for 20 ga | |
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03-18-2010, 10:29 AM
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the same for 20 ga
Would it be different for a 20 ga? I should have said before, that's my primary interest. Thanks
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03-18-2010, 10:49 AM
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Paul,
There is greater pressure as the gauges go from 12 to 16 to 20 etc. I would want a little more than .025 but could be mistaken. Harry |
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| The Following 2 Users Say Thank You to Harry Collins For Your Post: |
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03-18-2010, 11:33 PM
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#7 | ||||||
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I think I'd want to know who's doin' the measurin' and how... its a bit of a tricky business.
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| The Following User Says Thank You to Dave Fuller For Your Post: |
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03-19-2010, 08:02 AM
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#8 | ||||||
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The Field March 7, 1891 Vol 77:325
http://books.google.com/books?id=inQ...=0#PPA9-IA6,M1  UK Working Standards recomended minimum wall thickness measured 18" from the barrel breech from Double Gun Classics p. 56, Vol. 1, No. 4 Jan-Feb, 2006: 2 1/2" 12g- .028 2 3/4" 12g- .032 Re-proof recomended minimum- .024 The Hunter's Encyclopedia from the German proof house: minimal wall thickness at end of chamber, regardless of length, for 12, 16 & 20 gauge guns should be 2.3mm (.0906") for 'ordinary good steel' or 2.1mm (.0827") if a 'Special Steel' was used. For the 24 & 28 gauges, due to their higher pressures, 2.4mm (.0945") was recommended. Minimal wall of .6mm (.0236") was recomended in the "forward third" of the barrel.
__________________
http://sites.google.com/a/damascuskn...e.com/www/home |
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| The Following 11 Users Say Thank You to Drew Hause For Your Post: |
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03-19-2010, 08:34 AM
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So if you start with typical Parker wall thickness of say .032 for all gauges ( heavy waterfowl guns were thicker) and honing once often takes .008, then you have .024, and then a second hone to clean the bores because used gun buyers like shiny bores because it shows the gun was not used much, another .008, and you are at......
I'm aware of a 20ga Parker ruptured barrel in the forward 1/3rd, wall thickness .006, but those bores sure were shiny. No obstruction. |
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| The Following 2 Users Say Thank You to Bruce Day For Your Post: |
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03-19-2010, 09:33 AM
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Bruce Is not .006 below the mwt. of .025 that some say is ok ?
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