Red Dot is great for low pressure loading and most people feel most comfortable sticking with the lighter loads.
Yes I use it for light loads, but I have also been pleased with the results when I went warmer. I have gone through a large volume of very warm 357 magnum loads with this powder.
If I had a 44 mag, had your quantity of Red Dot and wanted "mid range" loads, I would go ahead and slowly work up to close to the max from the 1996 to 2000 range of Alliant books (link to the 2000 book previously provided).
If your bullet is a good match, I would probably stop at about 10% short. If using a different bullet, 15% to 20% gr short would probably be a good idea.
The basis for the above can be seen from the following two loads. The 2000 data shows 8.8 gr and 1175 fps for a 240 cast lead bullet. It shows 7.7 gr and 1180 fps for a 240 JSP.
FYI, As a sanity check I looked up the Hodgdon load data for 700x (very close to Red Dot). Hodgdon still shows a 240 gr cast lead bullet loaded to 1185 fps using 9.5 gr of 700x.