Yep I do the same thing with Lil gun powder. I think the range for 240 grain bullets is 18 to 20 so I load her up with about 17 grains. Just like you say its not full blast but good enough to know you are still lighting off a magnum. Of course mainly shooting 44spl most of the time(very mild Trail Boss powder) but got to bust out the Mag. loads every now and then.