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Pressure Test for 19gn Red Dot
Old 08-11-2017, 05:48 PM   #1
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Default Pressure Test for 19gn Red Dot

I sent the following three loads to Tom Armburst for testing, a scan of the tests is below. Loads where hand weighted as below:
A. 10ga. Federal hull cut to 2 7/8”, WW 209 primer, 19gr Red Dot, Remington SP-10 wad, 2x .125 card wads and 1 .70 card wad in bottom of wad, 1.125oz # 7 lead shot.
B. 10ga. Remington hull cut to 2 7/8”, WW 209 primer, 19gr Red Dot, Remington SP-10 wad, 3x .125 card wads in bottom of wad, 1.125oz # 7 lead shot.
C. 10ga Cheddite hull cut to 2 7/8", Remington SP-10 wad, 3x .125 card wads in bottom of wad, 1.125oz # 7 lead shot.
THIS IS NOT A RECOMMENDATION FOR INFORMATION ONLY. Pressure higher than I hoped for was hoping for 5200+- equal to black.
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Old 08-11-2017, 06:07 PM   #2
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Thank you, have been using this load for about 8 months and have been very happy with it, crows not so much. Glad to know the pressure in that i use all 3.
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Old 08-11-2017, 06:54 PM   #3
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Craig thanks for sharing this. I see the pressures and velocities as "period correct" for the short ten with 1 1/8 ounce load and they are great loadings for composite barrel guns and with a powder that has and should be available for a long time to come. I also believe this data shows that if one uses their head good short ten loads have and can be wildcatted. I will add these to 2 7/8" reloading data spreadsheet, very helpful since many of the powders on the existing data are obsolete.
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Old 08-11-2017, 07:30 PM   #4
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Craig, I don't load for Ten, but I do for 12,16&20 so am interested in seeing everyone's data. To what do you attribute the jump in pressure in #2 ?
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Old 08-11-2017, 08:19 PM   #5
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My guess would be the Remington hulls.
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Old 08-12-2017, 05:52 AM   #6
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The only difference is the remington hulls. The remington and cheddite hulls have similar internal volume but the plastic used on the cheddite hulls is softer more of a low density polyethylene. You will note that I had to add card wads to these loads versus 7625 because the red dot takes up much less room. Remington hulls have a larger rim diameter and will not chamber in my LC smith guns. Not a problem with federal and cheddite. So I plan to standardize on the cheddite hull since they are cheaper and very durable plus I obtain cheddite hulls from my non reloading buddies that shoot RST,s.
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Old 08-12-2017, 06:42 AM   #7
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Thanks, Craig. Hard to believe that the wall section of the Chedite and Federal shells can absorb as much as 800 psi. I'll admit, it's something I Never gave any thought to in 50 years of reloading.
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Old 08-12-2017, 06:59 AM   #8
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I have not handled a Cheddite 10ga hull, what is the base wad made of? Federal hulls with their fiber/paper base wads are known for lower pressures.
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Old 08-12-2017, 07:31 AM   #9
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Cheddite has a plastic base wad.
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Old 08-12-2017, 08:31 AM   #10
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Quote:
Originally Posted by Daniel Carter View Post
Cheddite has a plastic base wad.
I think a better question is why does a Federal hull produce lower pressure with all things being roughly equal, it's the fiber base wad, 89% the pressure of a Remington and 93% the pressure of a Cheditte in this test with Red Dot.
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