I agree with Bruce, but the only problem is many of the powders aren't produced anymore. I've always went by the thought that if it's a mild load in a 12ga, it's going to be less in a 10ga, even with a different wad and hull. All 10ga hulls are straight walled, so with mild loads I treat them all the same. JMHO, but pressures aren't going to change more that a couple of hundred psi if there's a slight difference in hulls. In the Alliant handbook, the same green Dot load in both the Federal and Remington hull have the same pressure. Should tell you something. I think a 10ga 1oz load is about as good as it gets. The shot column is so short there's way less shot deformation, and the shot string is shorter, so there's more shot at any given time in the pattern. Just use a 12ga 1oz load data. Did I say no recoil ? If one just has to go to those 1 1/4 or 1 5/8 oz loads the Alliant handbook shows Unique and Greed Dot with 7500 to 8800psi loads that should be good for our old SxSs. These are with our modern hulls that can be bought from BPI or Precision Reloading. We can use the old load data, but how many of us have those older hulls? All I have are the more modern Rem, Fed, and Win hulls. And they pretty much all look the same, and with slight adjustment can be all loaded the same. Oh, there's some slight differences in how high the base wad is, but that's only going to make a difference in total load height. That will make a difference is final crimp. I only shoot clay targets, with 1oz shells at lower pressures, so I sometimes forget some of you guys like more payload so your pressures could be quite a bit higher. I think if it's going to be a light load, then 12ga loads will work just fine. If heaver, then those two Alliant loads with those two powders will work. JMHO. Someone please pipe in if you find fault with what I said. Different opinions are always good.
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Paul Harm
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