Alliant Powder, the makers of Blue Dot, while listing Blue Dot for the .41 Remington Magnum for many years, has withdrawn the powder from use with this cartridge. No reason given although there is a good deal of speculation and many accounts of interactions with Alliant’s lab without substantiation. Many years ago, pressure related problems arose when shotgun powder came into popular use with magnum revolver cartridges as the characteristics of the powder had been mapped up to maximum shotgun pressures and well under even 20,000 PSI. When tested to a higher pressure standard, they tended to spike and become erratic at magnum handgun pressures.
Alliant does continue to list Blue Dot for use with the 40 S&W, 10mm Auto, 44 Special, .44 Magnum, etc. and Alliant previously published load data mimics the still published Blue Dot data from Hornady, Sierra, Speer, and Lee current reloading manuals, most published after Alliant’s withdrawal of recommendation. The loads on this page were selected from a different point in our handload development than originally listed to underscore the need to careful handling of these combination, however, as is the case with all major component suppliers that provide load data, we see no reason to delist the powder type. I am not challenging Alliant’s decision or advisory, but it would be helpful if they were more forthcoming with information.