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MikeH. 
Group: MEMBER
Location: Illinois
Posts: 1214
Joined: Nov. 2007
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Posted on: Feb. 24 2012,2:26 |
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In shot guns we have 12, 16, 20, 28 and some others much more rare. Then we have the .410.
The 12= .730
20= .615
28= .550 inches.
There is over boring and differences between companies but these are pretty much the standard.
The .410 is a caliber not a gauge. I have read that if it were converted to gauge it would be a 67 gauge.
I don't see how. I would think it would be about 45 gauge by looking at the difference is size between it and the 28 and looking at the difference between the 20 and the 12.
I assume it has to do with the lead balls, ie. 12 lead balls .730 in size equal a pound.
It just has never made sense to me. Can any one explain it?
I am bored, thought this needs to be answered.
Mike
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| Post Number: 2
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Skybuster
Group: 2013 CONTRIBUTING MEMBER
Location: North of Hwy 64
Posts: 2089
Joined: Dec. 2009
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Posted on: Feb. 24 2012,2:34 |
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Mike, you need to get out more. I know cabin feaver when I see it! 
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We know the way of a snake on a rock, and we think we know the way of a man with a maid. Do we know the secrets of the wild creatures? Frank Woolner
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| Post Number: 3
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RUFUS80
Group: MEMBER
Location: The Hoosier State
Posts: 513
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Posted on: Feb. 24 2012,3:07 |
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From Reloading for Shotgunner 4th ed-
If gauge is applied to the 410, of would be a 36 gauge. The 410 refers to the caliber. The word gauge was hung onto it for simplicity sake.
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"The gun is the essential link between the man and the kind of sport he pursues. It is not enough that it should be well adapted to one of the other. For the best success, it must be fully adapted to both" - Gough Thomas
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| Post Number: 4
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RUFUS80
Group: MEMBER
Location: The Hoosier State
Posts: 513
Joined: Jan. 2007
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Posted on: Feb. 24 2012,3:13 |
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I too have seen it named a 67 gauge. I think that would be closer because doing some math 7000 grains to a pound divided by 67 is 104.47 grains. Which this is closer than 36 equals 194.44. But anyway the 410 is a caliber not a gauge.
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"The gun is the essential link between the man and the kind of sport he pursues. It is not enough that it should be well adapted to one of the other. For the best success, it must be fully adapted to both" - Gough Thomas
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| Post Number: 5
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CC setter
Group: 2013 CONTRIBUTING MEMBER
Location: Cape Cod
Posts: 27
Joined: Dec. 2011
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Posted on: Feb. 24 2012,4:10 |
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a 12ga. .730 take the weight of a .730 ball of lead and divide it into a pound (545gm) it will = 12
take the dia. of any gage in a lead ball divide it into a pound and it will give you the gage.
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shinbone
Group: 2013 CONTRIBUTING MEMBER
Location: Littleton, Colorado
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Posted on: Feb. 24 2012,5:35 |
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I think I read somewhere that the "gauge" measurement system is not used for smaller than 50 gauge, by convention. Thus, a .410" diameter bore is spec'ed in units of caliber rather than units of gauge because .410" converts to 67 gauge.
--shinbone
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| Post Number: 7
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mike campbell
Group: 2013 CONTRIBUTING MEMBER
Location: western NY
Posts: 1553
Joined: Feb. 2006
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Posted on: Feb. 24 2012,6:02 |
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The .410 would be 67 gauge.
The shotgun gauge was derived from the number of lead balls of a nominal diameter obtained from 1 pound (454 grams) of lead.
A .730 ball of pure lead weighs 37.9 gm; 12 per pound.
A .411 ball of pure lead weighs 6.74 gm; 67.3 per pound.
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| Post Number: 8
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mike campbell
Group: 2013 CONTRIBUTING MEMBER
Location: western NY
Posts: 1553
Joined: Feb. 2006
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Posted on: Feb. 24 2012,6:13 |
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Better hope you're not up against a better mathematician than I. 
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CC setter
Group: 2013 CONTRIBUTING MEMBER
Location: Cape Cod
Posts: 27
Joined: Dec. 2011
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Posted on: Feb. 24 2012,7:19 |
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 i should have done the math and check for errors
(454g)
thanks mike c.
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| Post Number: 12
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MikeH.
Group: MEMBER
Location: Illinois
Posts: 1214
Joined: Nov. 2007
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Posted on: Feb. 27 2012,11:10 |
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Well Mike I think I did actually read that some place in the past.
It must have slipped my mind.
Trivia, I love it.
And yes cabin fever is not pretty.
Mike
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| Post Number: 13
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mike campbell
Group: 2013 CONTRIBUTING MEMBER
Location: western NY
Posts: 1553
Joined: Feb. 2006
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Posted on: Feb. 27 2012,1:14 |
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I've always liked figgerin' on the back of a napkin. Thing is, I lose the napkin and some other joker steals my answers, like E=MC^2. 
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| Post Number: 14
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Greg Hartman
Group: 2013 CONTRIBUTING MEMBER
Location: Pennsylvania
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Posted on: Feb. 27 2012,2:03 |
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Silly question: Didn't the .410 originally come from loading shot in .45 Colt cases, instead of being developed at the outset as a shotgun cartridge? If so, then the caliber, as opposed to gauge, reference makes some sense. But, if that's so, why isn't it called the .450 instead of the .410?
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It's not just a passtime - it's a way of life!
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| Post Number: 15
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mike campbell
Group: 2013 CONTRIBUTING MEMBER
Location: western NY
Posts: 1553
Joined: Feb. 2006
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Posted on: Feb. 27 2012,3:30 |
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I think the American legend is that it came from the .44XL shot cartridge, but that's not much closer than .45.
I think the consensus among collectors is that it originated in Europe decades before it was first loaded in America and may have come from the .41 Rigby.
Likewise, the 12mm and/or 36 gauge monikers also originated in Europe. The 12 mm refers to the head diameter, but I can't come up with 36 gauge mathematically from the lead ball paradigm. There's some speculation it was just a logical progression from 16, 20, 24, 28, 32....36ga. It was never in much favor.
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