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06-13-2021, 03:34 PM | #3 | ||||||
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Bulk Smokeless ("E.C.", "Schultze", and DuPont) were introduced in the U.S. c. 1892, and were in general use by 1895.
The Parker Brothers 1893 Catalogue stated: “Our guns are bored on the latest improved system for shooting Nitros, or Smokeless Powder, and all our guns are tested with some one of the most approved makes, and a tag accompanies each gun, giving the results of such a (pattern) test.” A DuPont Ballistic Table was published in Parker Brothers' “The Small Bore Shotgun” c. 1920 http://parkerguns.org/pages/PDF%20Do...%20Shotgun.pdf Numbers require adding 10 - 14% for modern piezo transducer pressures. 12 gauge 3 Dr. Eq. 1 1/8 oz. = 8,110 psi 3 1/4 Dr. Eq. 1 1/8 oz. = 8,960 psi 3 1/2 Dr. Eq. 1 1/4 oz. = 9,900 psi More here https://docs.google.com/document/d/1...UOZEFU/preview
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06-13-2021, 09:06 PM | #4 | |||||||
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Dean... what is deemed a safe wall thickness?
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06-13-2021, 09:43 PM | #5 | ||||||
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These make a nice light target and small bird load. For pheasant out here on the plains , I go to 1 1/8 oz 3 dram loads.
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The Following 2 Users Say Thank You to Bruce Day For Your Post: |
06-13-2021, 10:41 PM | #6 | ||||||
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Most classic SXS folks believe .025" wall thickness to be the minimum for safe shooting. .
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The Following 2 Users Say Thank You to Dean Romig For Your Post: |
06-14-2021, 01:45 PM | #7 | ||||||
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Dean's answer would be the short version and it's a lot more complicated.
Since I've never found engineering drawings or specifications by ANY U.S. maker for wall thickness, the recommendations are based on lots of measurements of presumed to be unaltered barrels. http://parkerguns.org/pages/faq/BarrelThickness.htm Never missing an opportunity to rant , sellers commonly list MWT, never bothering, or not disclosing, end-of-chamber and 9" numbers. Consider this
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06-14-2021, 04:23 PM | #8 | ||||||
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My 1890 era 12's measure .750 my 10's from the same era measure .780. After 1900 the 12's measure .730 I don't own any 10's past 1898, but my two 10's from that date still measure .780. I have a 1891 CH 12ga on a #1 frame that measures .750 and still has min walls of .036 (.060 at 9" from the muzzle)and the gun weights 7lbs 4oz exactly to the letter so I believe the barrels are untouched. Just my 2 cents.
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06-14-2021, 11:42 PM | #9 | |||||||
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