Green Dot is a little slow for a big bore like the ten and light shot loads like 1 1/8. Green Dot should be OK for 1 1/4 ounce loads. You are inviting bloopers in cold weather if you load GD in 1 or 1 1/8 ounce loads. I see no reason why a load of 22 to 24 grains of Red Dot wouldn't work under 1 1/8 ounces of shot over an SP10 wad. As a matter of fact, I would even use a faster powder like Bullseye but I use Red Dot just because I have a lot of it around the house. It is all I use for 12 gauge. In a big hole like the ten gauge, my favorite loads of 23 or so grains of Red Dot shouldn't be exceeding 7500 PSI when propelling 1 1/8 ounces of lead. In a gun like the original poster mentions, a nice heavy NID, the pressure of a 1 1/4 ounce load over Red Dot should be OK, but the pressure level may be higher than you would want to use in a light Damascus gun. It's too bad that Sherman Bell did most of his experimenting with powders that are not as readily available or as cheap as good old Red Dot.
