From Alliant's website:

During the latest review Alliant Powder discovered that Alliant Powder's Blue Dot® should not be used in the following applications:

Blue Dot® should NOT be used in the 357 Magnum load using the 125 grain projectile (Blue Dot® recipes with heavier bullet weights as specified in Alliant Powders Reloading Guide are acceptable for use).



You can basically choose any pistol or shotgun powder from 2400 on down for a plinking load. IMHO for best accuracy and to keep pressures down and risks of pressure spikes a medium burning rate powder is the best choice.