|Umm.. what warning?|
Early last summer/fall, Alliant had started re-evaluating Blue Dot loads previously published for handguns, due to recent changes in manufacture, which are said to make it cleaner burning. (I personally never noticed a problem before.)
They have changed the powder in some way, and it is now said to be some "hotter" than the old mixture. Soo... in a grand CYA maneuver,
Alliant decided to warn everyone that "old" Blue dot loads, if used with the "new" Blue Dot, would possibly cause weapons to spontaneously disassemble, with associated collateral damage, in addition to frightening the horses and causing old ladies to faint.
Now, If I have understood correctly, there is a total prohibition of Blue Dot for .41 Magnum loads, and only a few recommended for the 357 magnum, 44 Magnum and Special, and .45 Colt, and no new data have appeared on their web site. HANDLOADER magazine, February issue, has a very short article, and about a half-dozen recommended loads. They appear to be on the mild side, although the velocities are respectable.
Chambered 221; you got it!