I want to mention here , that in the latest Speer reloading manual they have a 41 magnum load using Blue Dot powder . It is the " exact " load that I have been using for years . I worked up to it starting @ 12 grs with a 210 gr cast bullet . It gets me into magnum territory , very accurate shooting and clean .
If Blue Dot is fine in the 357 ( not using light weight bullets ) and the 44 mag , then why not the 41 ? The biggest problem is it seems, that it is " temperature sensitive - inverse " , that is in low temps the pressure builds higher in any application, shotgun - pistol etc .
It's interesting as Alliant and Speer are both owned by the same parent company . I guess they don't talk to each other though .