John,

Longshot is in the general burning range of Bluedot and it's usefulness is similar.I use Longshot for heavy shotshell loads and for that,it is absolutely excellent.

I have not used it in pistol loads but due to it's burning rate,it will not be good for light target loads.I don't have any data under my nose at the moment but it should be good for moderately hot loads in your 44 magnum.Hodgdon lists load data on the web.I do know that there is data for this powder for handgun loads.If I understand correctly,you're looking for a mild paper punching load and if that's the case,Longshot is not the best choice.