Because it is a very versatile powder. Longtime user with 45 200 swc load. Now I load it for 9mm 147s too, nice and soft. Great in my 38s and 357s. SOME loads are a little smelly and sooty, it gets a bit hot, but man it just works.
So yesterday I decided to work up a load for my 44 mag with a 300 soft point. A max load using Hodgdon data yielded 1075fps with an sd of 5 fps for the cylinder of rounds in a Ruger Vaqeuro with 5.5" barrel. Next I went with W296. Hodgdons max netted a whopping extra 50-60 fps using twice the powder. I then went to Speer data that used the copper crusher method for pressure. This added 2.5 more grains of powder and netted an extra 100 fps over the Titegroup load. All this by using 12 more grains of powder. My son commented he could feel this one in his chest when I shot it lol. Surely a longer barrel would tip the scale a bit more but wow, not much to see here performance wise.