It probably wasn't, but it also falls into the same category as H110/W296. If there is a problem with two cartridges, then there's a problem that hasn't been addressed properly. In this kind of situation, you don't issue warnings, you issue recalls of the offending products.

You also don't make a blanket warning when people have been safely using Blue Dot loads in .357 and .41 for 30 years. The simple solution is to recall all of it or recall what lots are presenting the problem.

It has to be remembered that everyone doesn't have access to internet warnings and some don't want access!