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 ½ 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 ½ 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 ½ lead shot.
THIS IS NOT A RECOMMENDATION FOR INFORMATION ONLY. Pressure higher than I hoped for was hoping for 5200+- equal to black.
Craig Larter

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.

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.

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 ?

My guess would be the Remington hulls.

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.

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.

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.

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.