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Joined: Dec 2001
Posts: 12,743
Sidelock
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Sidelock
Joined: Dec 2001
Posts: 12,743 |
Gunman; I believe you have your decimal point one place off. 1 mm = .03937" (1/25.4) or approximately .040". Thus .1 mm = .004" while .01 mm = .0004" or a bit less than thousandths. I was thinking the sizes were only stamped to one decimal place but wasn't absolutely certain so didn't say it that way. In machine shop lingo, although not perhaps technically correct .1 was called 100 thousandths, .01 10 thousandths, .001 one thousandth &.0001 one tenth, which meant it was a tenth of a thousandth. This was universal among all machinists I ever knew & many of them came from widely different locations.
Miller/TN I Didn't Say Everything I Said, Yogi Berra
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Joined: Apr 2011
Posts: 610
Sidelock
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Sidelock
Joined: Apr 2011
Posts: 610 |
Thanks again, I talked to the gunsmith this afternoon. The bore diameter stamp is 15.9. That converts to .626 inches, a little closer. He is going to calibrate his gauge and read it agian. Other stamps are CAM .70 and HE 1.200 . I was on a cell phone in a poor service area, I'll try to get more info later. I usually use the choke chart on Hallowell's site. It shows 20g, .005-.011 IMP and .012-.019 MOD terc Hallowell is the only one that uses a spread like .005 to .011???? The only thing I can figure is they are talking about an IC choke giving an IC size pattern at a given yardage. I know I have been surprised when patterning guns giving much smaller or larger patterns than they should have, given the restriction. I am convinced how the choke is configured has a lot to do with the size pattern it may give.
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Joined: Dec 2001
Posts: 12,743
Sidelock
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Sidelock
Joined: Dec 2001
Posts: 12,743 |
The Cam 70 means it has a 70 mm (2 34") chamber, don't recall the HE offhand.
Miller/TN I Didn't Say Everything I Said, Yogi Berra
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Joined: May 2010
Posts: 1,534 Likes: 95
Sidelock
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Sidelock
Joined: May 2010
Posts: 1,534 Likes: 95 |
Piper you are correct and sorry for the confusion . This modern metric is not my favourite. It was always claimed the British gun trade worked in "attles" to wit attle do and attle be near enough .
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Joined: Jul 2006
Posts: 197 Likes: 5
Sidelock
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Sidelock
Joined: Jul 2006
Posts: 197 Likes: 5 |
Not to split hairs but, one (1) mm=.3934 inches, not .3937 inches. Obviously I AM splitting hairs!! Sorry.
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Joined: Mar 2012
Posts: 351 Likes: 6
Sidelock
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Sidelock
Joined: Mar 2012
Posts: 351 Likes: 6 |
So now a mm is well over a quarter of an inch long? And where did you get the "hair" to split?
Sam Welch
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Joined: Dec 2001
Posts: 12,743
Sidelock
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Sidelock
Joined: Dec 2001
Posts: 12,743 |
Well not to split hairs "BUT" 1 cm =.3937". 1 mm =.03937". Rounding mm's to four decimal places will give .0394". My convert program shows 1 mm carried to 8 decimal places as .03936996. Rounding to 5 places gives us .03937, not .03934. Here is my original statement on this, as you can see I did use mm's not cm's which was actually the error I was correcting & to which you have followed suit; I believe you have your decimal point one place off. 1 mm = .03937" (1/25.4) or approximately .040". Thus .1 mm = .004" while .01 mm = .0004" or a bit less than thousandths.
Miller/TN I Didn't Say Everything I Said, Yogi Berra
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Joined: Jan 2002
Posts: 11,464 Likes: 133
Sidelock
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Sidelock
Joined: Jan 2002
Posts: 11,464 Likes: 133 |
Those guys who talked about the number of angels that could dance on the head of a pin have nothing to us with our hair-splitting! Not positive, but I believe the HE 1.2 might be the barrel weight in kg.
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Joined: Dec 2001
Posts: 12,743
Sidelock
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Sidelock
Joined: Dec 2001
Posts: 12,743 |
1.2 kg would convert to around 2 lb 10 oz. This would certainly be a feasible weight for a light set of barrels. I was just not sure what the HE stood for so was hesitant to state this was bbl weight, but you're probably right Larry.
Miller/TN I Didn't Say Everything I Said, Yogi Berra
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