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Joined: Nov 2004
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Sidelock
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OP
Sidelock
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Does anybody know where to find them???
J.W.H
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Joined: Dec 2001
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Sidelock
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Sidelock
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Lyman has published a Black Powder Handbook in the past, may have a current edition in print, not sure. Pressures were given for shotgun loads, though primarily for muzzle loading. As black is much less sensitive to external conditions than smokeless I suspect pressures would be similar loaded into a regular hull. It is noted that pressure recorded by DuPont back in the late twenties I believe it was with then current Dupont FFFG black using 3 drams under 1¼oz shot showed a pressure of near 9,000 psi, higher than what Lyman recorded in their testing using "Modern" GOEX powder.
Miller/TN I Didn't Say Everything I Said, Yogi Berra
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Get the Lyman book.... Pete
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Joined: May 2007
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It strikes me that those pressures are surprisingly high for black in Drew's first graph (near 10,000 psi!). The powder charges do seem quite heavy in Pete's tables; the graphs seem not to reflect the data in the table - they all look the same to me?
I tend to stay in the 2 1/2 - 3 dram range. RG
Last edited by cadet; 08/15/09 08:52 PM.
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Sidelock
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RG - Miller's example used 3F, while Pete's tables above used 2F. I am assuming that's what created the pressure difference.
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I'm looking for pressure in some smaller guages. like 28ga. 410 etc.
J.W.H
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Joined: Dec 2001
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In the 50's American Rifleman article from which that graph was taken (note it was re-produced for this article, was originally preparred by the DuPont labs in the 20's as I recall) it was stated that Black Powder had reached the peak of its effiency in the last decades of the 1800's. A lot of newer Black Powders are simply not up to the oplder powders. The quality of the charcoal used plays a large part in this as I understand it. Note the Elephant is consistently below the GOEX in both velocity & pressure. No data is listed here for Swiss, which is generally of a higher grade. The diference between the 2F & 3F would of course play a small part, but should not account for differences of any where near this magnitude.
Miller/TN I Didn't Say Everything I Said, Yogi Berra
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Joined: May 2007
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Sidelock
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I have an electronic copy of an Article from Guns magazine, March 2000, by Holt Bodinson. It lists test data from the 1960s:
82gr / 3dr FFF, 1 1/8oz 7.5, 1205fps, 4900psi 109grs/4dr FFF, 1 1/8oz 7.5, 6900psi (no velocity offered).
That's why I find pressures reaching as high as 10,000psi, even with FFF, so surprising. RG
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Sidelock
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Sidelock
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That graph is a redone version from the 1933 booklet published by Dupont, written by Coxe. He goes on about that chart for several pages. Pete
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